Carabiner Clip and Bottle Opener by Nite-Ize. I have this [the stainless version] and find it very handy when I travel. I keep it in my toiletry bag or backpack. It functions as both a utility carabiner (no climbing) and a bottle opener.
I’m a big fan of Nite-Ize Gear. Along with the S-Biner Carabiner Opener I have… the Nite Ize KMT-11-R3 DoohicKey Multi-Tool, KBB9-03-01 KnotBone Adjustable Bungee, SBL-03-11 S-Biner GetLit, Stainless, C9L-02-01 Large Figure 9 Carabiner and Gear Tie Clippable Twist Tie. In my opinion… they make some really well thought out, innovative and quality stuff.