Key organization is the weak point of many everyday carry setups. Carabiners are often clunky, heavy, or both. Key rings suck. And if you have a giant key fob, it only makes matters worse. Then you have the problem of small S-Biners coming unhooked when you don't want them to. (I've temporarily lost my keys countless times thanks to dual-gated carabiners.)
Those are all problems the MSTR LINX aims to solve.
Successfully funded on Kickstarter earlier this year, MSTR LINX from MSTRMND Collective is a titanium carabiner and key ring set that connect using specific interlocking shapes. The key rings and carabiner can only be separated intentionally and by lining up the tiny openings on both in a specific way -- sort of like those interlocking ring puzzles from your childhood.
MSTR LINX is made of CNC-machined Grade 5 titanium with a stone tumbled finish. It also features a shape very similar to the S-Biner from Nite Ize in that it has an upper gated section and a lower loop with the special locking mechanism for attaching keys. Hidden inside the gate is a bottle opener (of course) The crazy part? The set -- one carabiner and two MINI LINX -- weighs just 0.8 ounces.
If you want a MSTR LINX set to call your own, you can pre-order the set right now directly through the MSTRMND Collective website. That said, you're going to have to cough up $75. That price, fortunately, includes tax and free shipping within the US. (Outside the US, shipping will cost an additional $13.) All pre-orders will ship by August 31.