Emmawrote a review of Platypus DuoLock SoftBottle on August 14, 2017
I've used the soft platy bottles for years, they're ideal for packing light but porting a bunch of water. I'm digging the new duo lock system. The cap is snug and nicely threaded for tight closure, and a larger opening for filling up. The drinking spout is a bit smaller and locking mechanism is easy to use. I'm enjoying the attached clip as well, great for river trips or scenarios where you just need to keep everything connected.