Safe, fool-proof, easy to use and compliant with recycling standards, CrunchIt punctures Jetboil Jetpower (and certain other) butane fuel canisters, making them recycling bin ready. 

Lightweight, rugged stainless steel construction
Safely vents fuel prior to puncturing
Clips onto carabiner or key ring for convenience
Useful Jetboil toolkit with bottle opener and wrench integrated into handle