If you are considering "belt-ware" in that size range I would think that the surplus jungle FAK pouch(no dimensions listed but I think it is 3"X5"X2") would be better. If you wanted it waterproof you could line it with a ziplock. The soft-side nature allows for a much greater flexibility when packing it. I imagine that the paint could be coerced off the outside or you could find one without the paint at your local surplus dealer. For something slightly larger you could look at this surplus bag 6"X4"11" with tunnel loop at the back for belt wear. Both of these are to be found for under $5 at majorsurplusandsurvival.com. With a very little sewing the larger one could be turned into 6"X4"X6" for smaller, more discreet, carry.