I have two friends who’ve been carrying these slim, multi-tools for a few years now and swear by them. I’ve only used the mini-screwdriver and bottle opener, but those functions alone seem worth it. It’s stainless steel and will add some weight to your load, but no more than the average metal beverage pop-top. Why junk up your keychain when you can slip another “card” into your wallet? Added bonus: can opener, straight edge, knife edge, et al.
– Steven Leckart