I made up a capped pipe to store LP gas canisters on a stern rail stanchion. I drilled a 1/8" hole in the bottom cap to handle expansion or leak ventilation and made the top a screw cap. I got a length of aluminum flat stock from the hardware store (about 1/8" thick x 1/2 or 3/4" wide) and cut it to size, bent the bottom into an "L" to hook under the bottom canister and the bent the top into an "L", so when I open the top I can just lift the aluminum stock and grab a can of LP gas. Measure your cans and decide how many you want to store.

BTW -- the writing that comes on the PVC pipes wipes off easily with Interlux 202 solvent, and probably many other solvents.