I'm reviewing the Altego fidlock keychain with carabiner. This uses fidlock technology, which is basically magnets with this nice slide. You can kind of see it. You can only slide off in one direction, but snap it back in. No problem. Right. You got your carabiner. You can attach it to your backpack, make it really easy to find your keys. You don't need to go in your back pocket, and have your keys, rip your pants, or your hands way down your backpack searching for your keys. It's one hand access. Magnet snaps it right back on. Super simple. Two for fifteen bucks on Amazon. You can't go wrong.