{"id":102540,"date":"2026-02-18T17:35:24","date_gmt":"2026-02-18T23:35:24","guid":{"rendered":"https:\/\/actionpkg.com\/?p=102540"},"modified":"2026-02-18T17:35:24","modified_gmt":"2026-02-18T23:35:24","slug":"how-to-choose-the-right-size-mil-thickness-closure-type-for-zip-locking-plastic-bags","status":"publish","type":"post","link":"https:\/\/actionpkg.com\/blog\/how-to-choose-the-right-size-mil-thickness-closure-type-for-zip-locking-plastic-bags\/","title":{"rendered":"How to Choose the Right Size, Mil Thickness, &#038; Closure Type for Zip Locking Plastic Bags"},"content":{"rendered":"<article style=\"max-width: 920px; margin: 0 auto; padding: 22px 18px; line-height: 1.6;\">\n<header style=\"margin-bottom: 18px;\">\n<p style=\"font-size: 18px; margin: 0 0 10px; color: #333;\">If you store, kit, pick, pack, or ship parts like hardware and fasteners, the right plastic reclosable bag can reduce product mix ups, improve organization, and protect contents from dust, moisture, and handling damage. This guide walks you through sizing, mil thickness, and closure options using simple, practical rules.<\/p>\n<\/header>\n<section style=\"margin: 18px 0 22px; padding: 14px 14px; border: 1px solid #e5e7eb; border-radius: 14px; background: #fafafa;\">\n<h2 style=\"font-size: 20px; margin: 0 0 10px;\">Quick Takeaways<\/h2>\n<ul style=\"margin: 0; padding-left: 18px;\">\n<li><strong>Start with sizing:<\/strong> measure contents, then add extra room so the seal closes easily.<\/li>\n<li><strong>Choose thickness by risk:<\/strong> sharper, heavier, or abrasive parts usually need higher mil.<\/li>\n<li><strong>Pick the right closure:<\/strong> standard press to close for everyday use, double track for added seal strength, slider for frequent access.<\/li>\n<li><strong>Standardize where possible:<\/strong> fewer bag SKUs improves efficiency, training, and reordering.<\/li>\n<\/ul>\n<\/section>\n<section style=\"margin: 0 0 26px;\">\n<h2 style=\"font-size: 26px; margin: 0 0 10px;\">Why Size, Thickness, and Closure Matter in Industrial Use<\/h2>\n<p style=\"margin: 0 0 12px;\">In manufacturing, distribution, and MRO environments, packaging decisions affect more than storage. The wrong bag can cause parts to puncture through, slow down pick and pack workflows, or create quality issues from contamination or mixed parts.<\/p>\n<div style=\"display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px;\">\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\">Fewer picking errors<\/h3>\n<p style=\"margin: 0; color: #333;\">Clear, right sized packaging helps teams identify the correct SKU quickly.<\/p>\n<\/div>\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\">Less damage and loss<\/h3>\n<p style=\"margin: 0; color: #333;\">Correct mil thickness reduces punctures and keeps small parts contained.<\/p>\n<\/div>\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\">Better organization<\/h3>\n<p style=\"margin: 0; color: #333;\">Standardized sizes improve bin setup, kitting, and cycle counts.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section style=\"margin: 0 0 26px;\">\n<h2 style=\"font-size: 26px; margin: 0 0 10px;\">Step 1, How to Choose the Right Zip Bag Size<\/h2>\n<div style=\"border-left: 4px solid #e92b2c; padding-left: 12px; margin: 10px 0 14px;\">\n<p style=\"margin: 0; font-size: 16px;\"><strong>Simple rule:<\/strong> measure your contents, then add enough room so the closure seals easily without stress.<\/p>\n<\/div>\n<h3 style=\"font-size: 18px; margin: 0 0 6px;\">Measure your contents the right way<\/h3>\n<ul style=\"margin: 0 0 12px; padding-left: 18px;\">\n<li><strong>Width:<\/strong> measure the widest point.<\/li>\n<li><strong>Length:<\/strong> measure the longest point, including any protruding edges.<\/li>\n<li><strong>Bulk:<\/strong> account for stacked or loose items that take up space.<\/li>\n<\/ul>\n<h3 style=\"font-size: 18px; margin: 0 0 6px;\">Add extra room so the bag closes cleanly<\/h3>\n<p style=\"margin: 0 0 12px;\">For loose items like screws, nuts, bolts, washers, and small components, add extra space so the contents can shift without pushing against the seal. This helps reduce punctures and makes packing faster.<\/p>\n<h3 style=\"font-size: 18px; margin: 0 0 10px;\">Common size ranges and practical use cases<\/h3>\n<div style=\"overflow-x: auto; border: 1px solid #e5e7eb; border-radius: 14px;\">\n<table style=\"border-collapse: collapse; width: 100%; min-width: 720px;\">\n<thead>\n<tr style=\"background: #f9fafb;\">\n<th style=\"text-align: left; padding: 12px; border-bottom: 1px solid #e5e7eb; width: 22%;\">Size range<\/th>\n<th style=\"text-align: left; padding: 12px; border-bottom: 1px solid #e5e7eb;\">Best for<\/th>\n<th style=\"text-align: left; padding: 12px; border-bottom: 1px solid #e5e7eb;\">Common examples<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\"><strong>Small<\/strong><\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">High count items and small parts<\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Washers, o rings, screws, small fittings<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\"><strong>Medium<\/strong><\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Kits, grouped components, mid size parts<\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Fastener assortments, repair kits, connectors<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\"><strong>Large<\/strong><\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Bulk parts and larger components<\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Grouped SKUs, sub assemblies, larger fittings<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px;\"><strong>Extra large<\/strong><\/td>\n<td style=\"padding: 12px;\">Heavy or bulky sets of items<\/td>\n<td style=\"padding: 12px;\">Mixed hardware bundles, larger component groups<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin: 12px 0 0; color: #333;\">Tip: Standardizing a small set of sizes usually improves training, speeds packing, and simplifies reordering.<\/p>\n<\/section>\n<section style=\"margin: 0 0 26px;\">\n<h2 style=\"font-size: 26px; margin: 0 0 10px;\">Step 2, Plastic Bag Thickness Explained, What Is a Mil<\/h2>\n<p style=\"margin: 0 0 12px;\">Thickness is measured in <strong>mils<\/strong>. One mil equals one thousandth of an inch. Higher mil thickness generally means higher durability and better puncture resistance.<\/p>\n<div style=\"display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px;\">\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\">Common question<\/h3>\n<p style=\"margin: 0; color: #333;\"><strong>How thick are zip lock bags?<\/strong> Many household style bags are thinner, while industrial reclosable bags are often selected in thicker mil options to handle heavier parts, sharp edges, and rougher handling.<\/p>\n<\/div>\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\">Best practice<\/h3>\n<p style=\"margin: 0; color: #333;\">Choose mil thickness based on the risk of puncture, abrasion, moisture exposure, and how frequently the bag is handled.<\/p>\n<\/div>\n<\/div>\n<h3 style=\"font-size: 18px; margin: 16px 0 10px;\">Mil thickness guide for industrial zip bags<\/h3>\n<div style=\"overflow-x: auto; border: 1px solid #e5e7eb; border-radius: 14px;\">\n<table style=\"border-collapse: collapse; width: 100%; min-width: 720px;\">\n<thead>\n<tr style=\"background: #f9fafb;\">\n<th style=\"text-align: left; padding: 12px; border-bottom: 1px solid #e5e7eb; width: 16%;\">Mil<\/th>\n<th style=\"text-align: left; padding: 12px; border-bottom: 1px solid #e5e7eb;\">Recommended use<\/th>\n<th style=\"text-align: left; padding: 12px; border-bottom: 1px solid #e5e7eb;\">Examples<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\"><strong>2 mil<\/strong><\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Light duty storage and low puncture risk<\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Light parts, paperwork, small non sharp items<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\"><strong>3 mil<\/strong><\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">General purpose for many industrial workflows<\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Everyday hardware, fasteners, small components<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\"><strong>4 mil<\/strong><\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Added durability for heavier or sharper contents<\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Screws, bolts, metal fittings, dense parts<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\"><strong>6 mil<\/strong><\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Heavy duty puncture resistance and rough handling<\/td>\n<td style=\"padding: 12px; border-bottom: 1px solid #e5e7eb;\">Sharp edges, abrasive parts, high handling environments<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px;\"><strong>8 mil+<\/strong><\/td>\n<td style=\"padding: 12px;\">Maximum durability for dense or high risk parts<\/td>\n<td style=\"padding: 12px;\">Heavy components and high value parts needing extra protection<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div style=\"margin-top: 12px; padding: 12px 14px; border: 1px solid #fde2e2; border-radius: 14px; background: #fff5f5;\">\n<p style=\"margin: 0;\"><strong>Tip for hardware and fasteners:<\/strong> Many teams start with 3 mil for general use, then move up to 4 mil or 6 mil for heavier, sharper, or more abrasive parts.<\/p>\n<\/div>\n<\/section>\n<section style=\"margin: 0 0 26px;\">\n<h2 style=\"font-size: 26px; margin: 0 0 10px;\">Step 3, Choose the Best Closure Type for Your Application<\/h2>\n<p style=\"margin: 0 0 12px;\">Closure type impacts speed, seal reliability, and how well the bag holds up to repeated opening and closing.<\/p>\n<div style=\"display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px;\">\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\"><a href=\"https:\/\/actionpkg.com\/product-category\/bags\/reclosable-bags\/clear-zip-bags\/\">Standard press to close<\/a><\/h3>\n<p style=\"margin: 0; color: #333;\">A dependable everyday choice for most industrial packaging needs. Good for bin storage, kitting, and shipping.<\/p>\n<\/div>\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\"><a href=\"https:\/\/actionpkg.com\/product-category\/bags\/reclosable-bags\/double-zipper-bags\/\">Double track closure<\/a><\/h3>\n<p style=\"margin: 0; color: #333;\">Added seal strength for heavier contents and applications where the bag sees more stress.<\/p>\n<\/div>\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\"><a href=\"https:\/\/actionpkg.com\/product-category\/bags\/reclosable-bags\/slider-reclosable-bags\/\">Slider closure<\/a><\/h3>\n<p style=\"margin: 0; color: #333;\">Easy open and close for frequent access, including glove use in certain workflows.<\/p>\n<\/div>\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\"><a href=\"https:\/\/actionpkg.com\/product-category\/bags\/reclosable-bags\/tamper-evident-zip-bags\/\">Tamper-evident options<\/a><\/h3>\n<p style=\"margin: 0; color: #333;\">Useful for chain of custody, controlled access, and applications that require evidence of opening.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section style=\"margin: 0 0 26px;\">\n<h2 style=\"font-size: 26px; margin: 0 0 10px;\">Step 4, Match the Bag to Your Environment<\/h2>\n<p style=\"margin: 0 0 12px;\">Environmental conditions influence the right bag choice. Consider what your parts experience from storage to shipment.<\/p>\n<ul style=\"margin: 0; padding-left: 18px;\">\n<li><strong>Moisture and humidity:<\/strong> Thicker bags can help reduce issues in damp storage areas.<\/li>\n<li><strong>Static risk:<\/strong> Electronics and sensitive components may require <a href=\"https:\/\/actionpkg.com\/product-category\/bags\/reclosable-bags\/anti-static-bags-reclosable-bags\/\">anti static or static shielding<\/a> options.<\/li>\n<li><strong>Contamination control:<\/strong> Precision environments may need tighter handling and cleaner storage methods.<\/li>\n<li><strong>Handling intensity:<\/strong> The more your team touches the bag, the more thickness matters.<\/li>\n<\/ul>\n<\/section>\n<section style=\"margin: 0 0 26px;\">\n<h2 style=\"font-size: 26px; margin: 0 0 10px;\">Step 5, Improve Efficiency with Standardization and Labeling<\/h2>\n<p style=\"margin: 0 0 12px;\">The best results come from building a simple standard. Many teams reduce bag SKUs and improve accuracy by using consistent sizes and adding clear labels for part numbers, lot tracking, and kit identification.<\/p>\n<div style=\"display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px;\">\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\">Standardize sizes<\/h3>\n<p style=\"margin: 0; color: #333;\">Simplifies reordering and reduces confusion on the floor.<\/p>\n<\/div>\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\">Label consistently<\/h3>\n<p style=\"margin: 0; color: #333;\">Supports inventory counts, traceability, and kitting accuracy.<\/p>\n<\/div>\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; padding: 12px;\">\n<h3 style=\"margin: 0 0 6px; font-size: 16px;\">Improve visibility<\/h3>\n<p style=\"margin: 0; color: #333;\">Clear packaging helps teams confirm contents at a glance.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section style=\"margin: 0 0 26px;\">\n<h2 style=\"font-size: 26px; margin: 0 0 10px;\">Frequently Asked Questions<\/h2>\n<div style=\"border: 1px solid #e5e7eb; border-radius: 14px; overflow: hidden;\">\n<details style=\"padding: 12px 14px; border-bottom: 1px solid #e5e7eb;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">What mil thickness is best for hardware and fasteners?<\/summary>\n<p style=\"margin: 10px 0 0;\">Many operations use <a href=\"https:\/\/actionpkg.com\/product-category\/bags\/reclosable-bags\/clear-zip-bags\/\">3 mil or 4 mil<\/a> for everyday hardware. If the parts have sharp edges or the bag sees rough handling, <a href=\"https:\/\/actionpkg.com\/product-category\/bags\/reclosable-bags\/clear-zip-bags\/\">6 mil or thicker<\/a> is often a better choice.<\/p>\n<\/details>\n<details style=\"padding: 12px 14px; border-bottom: 1px solid #e5e7eb;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">Are thicker zip bags always better?<\/summary>\n<p style=\"margin: 10px 0 0;\">Not always. Thicker bags provide more durability, but they also add material and may not be necessary for lightweight items. The best choice depends on puncture risk, handling, and your workflow.<\/p>\n<\/details>\n<details style=\"padding: 12px 14px; border-bottom: 1px solid #e5e7eb;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">How do I prevent parts from puncturing a resealable bag?<\/summary>\n<p style=\"margin: 10px 0 0;\">Choose the right mil thickness, avoid overfilling, and allow extra space so parts do not press into the seal. For sharp or abrasive parts, move up to a heavier duty option.<\/p>\n<\/details>\n<details style=\"padding: 12px 14px;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">What is the best closure type for frequent access?<\/summary>\n<p style=\"margin: 10px 0 0;\"><a href=\"https:\/\/actionpkg.com\/product-category\/bags\/reclosable-bags\/slider-reclosable-bags\/\">Slider closures<\/a> are popular when teams open and close bags repeatedly. For everyday use, <a href=\"https:\/\/actionpkg.com\/product-category\/bags\/reclosable-bags\/clear-zip-bags\/\">standard press to close<\/a> works well. If you need extra seal strength, consider double track closure.<\/p>\n<\/details>\n<\/div>\n<\/section>\n<section style=\"margin: 0 0 8px; padding: 16px 16px; border: 1px solid #e5e7eb; border-radius: 14px; background: #f9fafb;\">\n<h2 style=\"font-size: 22px; margin: 0 0 8px;\">Need help choosing the right reclosable bags?<\/h2>\n<p style=\"margin: 0 0 14px;\">If you want to standardize sizes, reduce punctures, or improve kitting and pick accuracy, you can shop reclosable bags on your own or get in touch with our team for help selecting the best size, mil thickness, and closure type for your application.<\/p>\n<div style=\"display: inline-flex; flex-wrap: wrap; align-items: center; gap: 10px;\"><a style=\"display: inline-flex; align-items: center; justify-content: center; text-decoration: none; background: #e92b2c; color: #fff; padding: 0 14px; border-radius: 999px; font-weight: 800; line-height: 1; height: 40px; vertical-align: middle;\" href=\"https:\/\/actionpkg.com\/product-category\/bags\/reclosable-bags\/\" target=\"_blank\" rel=\"noopener\">Shop Plastic Reclosable Bags<\/a><a style=\"display: inline-flex; align-items: center; justify-content: center; text-decoration: none; background: #ffffff; color: #111; padding: 0 14px; border-radius: 999px; font-weight: 800; line-height: 1; height: 40px; vertical-align: middle; border: 1px solid #e5e7eb;\" href=\"https:\/\/actionpkg.com\/contact\/\" target=\"_blank\" rel=\"noopener\">Contact Our Team<\/a><\/div>\n<\/section>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>If you store, kit, pick, pack, or ship parts like hardware and fasteners, the right plastic reclosable bag can reduce [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":102558,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[19],"tags":[],"class_list":["post-102540","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-resources"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Choose the Right Size, Mil Thickness, &amp; 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