Would anyone know who might offer a selection of empty FAK soft cases for sale?

My vehicle kit was in a weatherproof metal box in the bed box of my truck, and it did not hold up well over time (rusted). I think I'd like to switch to a soft bag kept in the cab. I bought one many years ago to make a FAK for the bike (with emphasis on roadrash), but now I can't recall where I got it from (might have been REI). Worked out beautifully, about 4x6x1", individual pockets on one half, large mesh pocket on the other half for the bulky stuff, zipped together nice and compact. Looking for something along the same lines only larger.