There are so many models of custom folding shopping bags you can find at BSIGadget.com. All equipped with practical handles and extremely roomy, they take up very little space thanks to the ability to be easily folded. Opened they look like regular envelopes, but when folded they become small clutches, perfect for carrying in your purse, suitcase and keeping at home. Collapsible shopping bags are ideal for all activities because they do not take up space.