Patch kits are great to have as backup. In theory, you can get a patch kit, throw it in your pack, and forget about it until you need it. That's the theory. The reality is, by the time you need it, it comes out of its little pouch looking like a battalion of rats decided to run nibble-durability tests on it and it failed. On top of that, the little tube of rubber cement magically dried out even though it was sealed. The folks at Lezyne are as tired of this phenomenon as you are. Thus, the Lezyne Alloy Patch Kit. Of course, the first thing you notice when you see the Alloy Patch Kit is the fancy aluminum box. It's more than just clever packaging, though.The Alloy Patch Kit's forged aluminum case and rubber end cap are durable and waterproof. You can forget about rat attacks once the Alloy Patch kit is in your pack. The rubber cement issue is solved as well, due to the absolute lack of rubber cement. The synthetic rubber patches are backed with an aggressive adhesive that conforms to inflated tubes and requires no dry time. Even the patch kit instructions have a self-adhesive backing to use as an emergency tire boot in the event of a blown sidewall. You'll want to replace that tire, of course, but it's a quick fix that will get you home without having to hike.Each Lezyne Alloy Patch Kit contains nine glueless patches, a stainless steel scuffer, and emergency tire boot/instructions. Refill kits are available.