Adding a little safety to your backcountry arsenal, the MSR Child Resistant Fuel Bottle Cap has a "Push-and-Twist" design to keep your fuel bottle from accidently opening, in your pack or mistakenly by a little one. Compatible with all MSR fuel bottles built after 1981, you don't have to buy a whole new bottle when you want to kid-proof your backpacking equipment; just the cap. And because MSR likes to cross its t's and dot their i's, the Child Resistant Fuel Bottle meets US CFR 1700 and Health Canada requirements.