What Are Bottom Seal Poly Bags?
Bottom seal poly bags (also called bottom gusseted bags or flat poly bags with sealed bottoms) are constructed with a heat-sealed seam at the base of the bag, leaving the top open for filling. This design provides superior strength and leak protection compared to open-ended tubing.
Common Applications
Food Packaging
Perfect for dry goods, baked goods, candy, coffee, and spices. FDA-compliant materials ensure compliance with food safety regulations. Ideal for bakeries, confectioneries, and food manufacturers.
Industrial & Manufacturing
Protect parts, hardware, and components from dust, moisture, and contamination. Use as box liners or protective barriers during shipping and storage.
Medical & Pharmaceutical
Clean-room compatible options available for medical device packaging, pharmaceutical supplies, and sterile environments.
Customization Options
- Size: Any width x length combination
- Thickness: 1 mil to 6 mil (light duty to heavy duty)
- Material: LDPE (flexible), HDPE (stronger), or specialty films
- Printing: Add your logo, product info, or warning labels (up to 6 colors)
- Features: Hang holes, tear notches, resealable closures
Why Choose Prism Pak for Bottom Seal Bags?
With over 30 years in the packaging industry, Prism Pak delivers quality and reliability:
- Same-Day Shipping: Stock sizes ship the day you order
- Low Minimums: Small orders welcome (no 10,000-piece requirements)
- Expert Support: Not sure which bag fits your product? We'll help you choose.
- Competitive Pricing: Wholesale rates without middleman markup
Frequently Asked Questions
What is a bottom seal poly bag?A bottom seal poly bag is a flat polyethylene bag with a heat-sealed seam across the base and an open top for filling. The sealed bottom creates a leak-proof barrier that holds heavier contents better than open-ended poly tubing, which is why bottom seal bags are used for food packaging, parts bags, and box liners. Are bottom seal poly bags food safe?Yes. Our bottom seal poly bags are made from FDA-compliant polyethylene approved for direct food contact, so they can be used for baked goods, candy, coffee, spices, dry goods, and frozen foods, as well as pharmaceutical and medical supplies. What is the difference between bottom seal and side seal poly bags?Bottom seal bags have a single heat seal across the base, which makes them stronger and better suited to heavier items. Side seal bags have vertical seams on both sides, which makes them easier to run on automated filling equipment. What thickness of bottom seal poly bag should I choose?Choose 1-2 mil for lightweight items such as bread bags and garment covers, 3-4 mil for standard duty use such as food packaging and parts bags, and 5-6 mil for heavy duty use such as sharp objects and box liners. Bottom seal bags are available from 1 mil to 6 mil. What sizes and materials are available for custom bottom seal bags?Custom bottom seal bags are made to any width by length combination, in 1 mil to 6 mil thicknesses, in LDPE (flexible), HDPE (stronger), or specialty films. Options include hang holes, tear notches, and resealable closures. Can I order custom printed bottom seal bags?Yes. We print bottom seal bags flexographically in up to 6 colors with your logo, product information, or warning labels. Minimum order quantities apply on printed bags, while unprinted stock sizes ship the same day with no large minimum. Are bottom seal poly bags recyclable?Yes. Polyethylene bottom seal bags (LDPE and HDPE) are recyclable at most grocery store film drop-off locations. Look for collection bins marked for #2 and #4 plastics. Need help choosing the right bag? Call us at 1-800-544-7273 for expert guidance.
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