What Are Pre-Opened Poly Bags?
Pre-opened poly bags are specialized packaging designed for automated bagging equipment. Unlike flat poly bags that require manual opening, these bags feature a pre-slit front opening and perforated back panel that allows machines (or workers) to rapidly fill and seal packages without handling delays.
Why 1.5 Mil Thickness?
1.5 mil (0.0015 inches) is the standard thickness for most automated packaging applications. It provides:
- Optimal machine compatibility: Thin enough to feed smoothly through automated equipment
- Sufficient product protection: Guards against light punctures and contamination
- Cost efficiency: Lower material cost than heavier gauges for non-fragile items
- Clear visibility: Products remain visible for quality checks and customer appeal
Common Applications for Auto Bags
- E-commerce order fulfillment (apparel, accessories, small goods)
- Food packaging (dry goods, snacks, bakery items - FDA approved material)
- Hardware and small parts (fasteners, components, tools)
- Pharmaceuticals and medical supplies (non-sterile packaging)
- Industrial manufacturing (protective packaging for components)
- Subscription box fulfillment
Custom Pre-Opened Bags
Need something beyond our stock options? We offer full customization:
- Printing: Up to 8-color process printing (logo, branding, instructions)
- Colors: Tinted or opaque films (white, black, blue, etc.)
- Special features: Hang holes, headers, venting, UVI (UV inhibitors), VCI (corrosion protection)
- Custom sizes: Any width/length to fit your specific products
Custom orders ship within 4 weeks. Contact us for a quote or use our website chat for immediate assistance.
Frequently Asked Questions
What is a pre-opened poly bag?A pre-opened poly bag, also called an auto bag, is a tubular polyethylene bag wound on a roll with the front panel already slit open and the back panel perforated, so a bagging machine or a worker can drop the product straight in and tear the filled bag away. Our 1.5 mil pre-opened bags come on 3" cores with 1" diameter core plug holes and are available all clear or with a white front and clear back. What is the difference between pre-opened bags and wicket bags?Pre-opened bags come on rolls and feed through automated machinery, while wicket bags are stacked on a metal wicket for manual hand-packing. Pre-opened bags are faster for high-volume operations; wicket bags suit hand-packing stations where no bagger is installed. Is 1.5 mil thick enough for my product?1.5 mil is the standard gauge for most automated bagging and is thick enough for lightweight, non-fragile items with no sharp edges — apparel, accessories, paper goods, small parts, and dry food items. If your product has corners, points, or real weight to it, step up to 3 mil for general-purpose packaging or 4 mil for industrial parts. Are these bags food safe and FDA approved for food contact?Yes — our pre-opened poly bags are made from FDA-compliant polyethylene suitable for direct food contact, which is why they are widely used for dry goods, snacks, and bakery items. Always verify compliance for your specific application and product. Can I use these bags without an automated machine?Yes. The pre-opened front slit speeds up manual packing significantly, so hand-pack operations can use these rolls. Keep in mind that bags on rolls cost more per bag than standard flat poly bags, so if you are packing entirely by hand and do not need the speed, flat or gusseted poly bags are the more economical choice. What core size do these pre-opened bags fit?All of our pre-opened bags are wound on 3" diameter cores with 1" diameter core plug holes, which is compatible with most standard automated bagging equipment. Confirm your machine's maximum roll width before ordering. What size pre-opened bag do I need?Measure your product's length, width, and depth, then choose a bag 1 to 2 inches wider and 3 to 4 inches longer than the product so it inserts and seals cleanly. Bag width is the flat measurement across the bag, not the circumference. Contact us if you need help sizing against your bagger. How fast do pre-opened poly bags ship?Stock 1.5 mil pre-opened bags ship within 24 to 48 hours. Custom orders — custom sizes, tinted or opaque colors, venting, hang holes, headers, UVI or VCI, and printing up to 8-color process — ship in about 4 weeks. Related Products
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Order Today - Fast Shipping on Stock Items
Stock pre-opened poly bags ship within 24-48 hours. Wholesale pricing available on bulk orders. Need help choosing the right size or exploring custom options? Contact our packaging experts or chat with us now.
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