Practical guides for buying poly bags (PE bags): bag types, LDPE vs HDPE, thickness, sizing, printing and what to send a factory, from Tuosheng Packaging in Suzhou, China.
A gusseted bag is a poly bag with film folded into its sides, so it opens into a square base. Here are the 4 industrial uses, side vs bottom gussets, how to size a gaylord liner, and how to read W × G × L on a quote.
Plastic bag thickness is given in mil or microns, and a 2 mil (about 50 µm) bag suits most packing jobs. Here is a mil to micron chart, the right thickness for 6 common uses, how LDPE and HDPE change the choice, and how thickness drives bag weight and cost.
A poly bag is a bag made from polyethylene film, in LDPE or HDPE. Here are the 7 main types, how to choose the material and thickness, how to measure a bag, and the details buyers most often leave out of a custom poly bag order.