I've got a small Maxpedition EDC bag that I think is 4"x6"x.75" that easily fits in my front pocket. I can fit both ProVaris, a couple tanks and some supplies if I have to, but generally its just for hauling into or out of the office with just a single ProVari and tank and maybe a second tank. I'm going to get the Maxpedition Fatty bag soon that is 5"x7"x2" for longer trips. Maxpedition stuff is extremely rugged stuff that won't wear hardly at all, I'm betting it still looks brand new in 5 years with EDC use, which is hard to find with products you use all of the time... Think about most wallets you have for that amount of time.