Choose the bag size by measuring the item’s length, width, and depth, then adding room for loading and closure. The gusset must be large enough to expand around the thickest part of the item. If the bag is too tight, it can tear during packing or make sealing difficult. If it is too large, the product may shift and look poorly packed. For boxes or rigid items, measure the full outside dimensions. For soft goods, test one sample because compression changes the fit. If sealing is part of the workflow, make sure enough bag length remains after the product is inserted.