Deluxe Designs Envelope 5 3/8 x 5 1/4 inch (holds 5 x 5 inch square card). Clear re-sealable envelope/bag of archival quality for scrapbooking and card use. There are many possibilities for use. Card makers can put cards in these and seal to stop cards getting grubby. Scrapbookers may want to include a postcard or some other memorabilia in their scrapbooks that is not acid free. Pop it in these envelopes and your photos will be safe from products with acids. Also good for storing old photos etc.