So, today I received a batch of 1000 outer sleeves from vinyl storage solutions. BULK ORDER-4 mil SINGLE Pocket (12 inch) LP Vinyl Record Outer Sleeves - Crystal Clear CPP-500 Sleeves to a pack - WITH A TUCKABLE FLAP Cast polypropylene outer sleeves, 4mil, with tuckable flap. I have tested a few this morning and the fit nicely (even gatefold). I love the idea that it’s a tuckable flap. so no dust can enter + no adhesive strip! what also really made me want to buy these is that it’s made out of archival cast polypropylene that passed the P. A. T. test for no photographic enclosure reactivity. I think these are the sleeves that I want to use for all my records in the future. anyone else using them?