Gauge follows weight and edge
Two mil handles dry light goods. Three to four mil is the general-purpose range for powders, pellets and produce. Five to six mil belongs to anything with a sharp edge, anything heavy, and anything that will be dragged during discharge.
Gusseted or flat
A gusseted liner opens to the box's footprint and sits in the corners properly, which matters enormously for free-flowing product that would otherwise bridge. Flat liners are cheaper and acceptable for bagged or boxed contents inside the gaylord.
Food contact
If the liner will touch food, check current regulations and your customer's requirements before you order. Do not reason from appearance: clear film is not a credential. Ask the supplier for the resin documentation and keep it with your intake records.
Antistatic and barrier options
Resin pellets generate significant static during transfer; antistatic liners prevent both clumping and discharge hazards. Foil-barrier liners protect hygroscopic powders and extend shelf life for sensitive dry goods. Both should be specified at the same time as the box so they arrive matched.
