Some of my records are in plastic sleeves which have a seal like the seal on sandwich baggies (i.e.. two sides of sleeve press together to interlock). I have no recollection of where I got these, and do not see anything like them being offered by the suppliers of record collector items. They are roughly 13x13" usable space, the zipper seal adds a little. Sealable LP sleeves with an adhesive strip and flap are available, but I find them prone to open, or snag the jacket on the adhesive. Does anyone know if the large ziploc bags are available somewhere?? Thanks, Thomas.