The Ecopower USB Heated Gas Canister Cover from RIDGEMONKEY is designed to fit all common 440-500 butane / propane camping gas bottle mixes, the USB powered heating coil gently warms your gas bottle and makes efficient use of fuel even in the coldest conditions. Weather resistant, wipeable neoprene exterior with elasticated spoon strap and zippered bottom. 5V 2A USB input provides longer runtime and remains compatible with almost all common USB power sources.