a plastic bag is supplied as a continuously attached length of plural bags , each bag being separated from adjacent bags along a supply length by a perforated tear line . a seal which runs codirectionally with the tear line forms a closed bottom for each bag , such that when a bag is separated along the tear line from a remainder of the supply , the bag is enclosed along three of its four edges enabling containment of produce or other items placed therein via the opening at the fourth , and remaining edge of the bag which is coextensive with the perforation line . the supply length of bags is advantageously stored on a roll , fan folded , bundled or compactly stored in other suitable manner permitting advancement of consecutive bags when pulled out of the stored condition by a user . the perforation tear line cuts entirely through the continuous web supply of bags , however , the perforation along one side the bag is broken , such that the bag presents an open flap through which contents can be added to each bag prior to its removal fro the remainder of the continuous bag supply . a method of using the bags for packaging of produce , groceries or other articles generally selected at point of sale and which are generally segregated by type for later pricing by weight or unit , permits a user to at least partially fill a bag prior to removal from a continuous supply of plural bags .