Pre-Opened Poly Bags on Rolls | 3 Mil Auto Bags

A 3 mil pre-opened poly bag is a tubular polyethylene bag, 0.003 inches thick, wound on a roll with the front panel already slit open and the back panel perforated so the filled bag tears away cleanly. It is also called an auto bag. Ours are wound on 3 inch cores with 1 inch diameter core plug holes and come either all clear or with a white front and clear back — the white front gives you a printable, label-friendly panel while the clear back keeps the product visible for quality checks.

Use 3 mil when your product has weight, corners, or edges that would puncture a thinner film — hardware, fasteners, tools, small electronics, and heavier retail goods. 3 mil is double the thickness of the 1.5 mil standard auto bag, so it resists tearing on the bagger and in transit. Stay with 1.5 mil for lightweight, soft items like apparel, accessories, and paper goods where the extra material is wasted cost.

We stock the most popular 3 mil sizes from small 4 x 6 inch bags up to large 18 x 24 inch bags, and stock items ship within 24 to 48 hours. To size a bag, 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 loads and seals cleanly. Bag width is the flat measurement across the bag, not the circumference. Custom sizes ship in about 4 weeks.

Yes — these bags are made from FDA-compliant polyethylene suitable for direct food contact, which is why they are widely used for bakery items, candy, snacks, and other dry goods. Always confirm compliance for your specific product and application.

They run on most roll-fed automatic bagging equipment, including Autobag®, Minipack, and similar systems, because they are wound on standard 3 inch cores with 1 inch diameter core plug holes. Before ordering, check two things on your machine: the maximum roll width it accepts and its rated film thickness, since some baggers set up for 1.5 mil film need a seal-time or temperature adjustment to run 3 mil.

Yes. We print up to 8-color process on pre-opened bags and can also produce custom sizes, custom thicknesses from 2 mil to 6 mil, tinted or opaque colors, venting, hang holes, headers, UVI (UV inhibitor), and VCI (corrosion inhibitor). Custom orders ship in approximately 4 weeks; stock bags ship in 24 to 48 hours.