You're not imagining it: reusable water bottles are getting smaller. The trendiest option on the market, from Hydro Flask, is as small as an iPhone.

Hydro Flask is shrinking its water bottles with a Micro Hydro Bottle that’s small enough to fit in your pocket. This mini-sized Micro Hydro Bottle will be available in four colors — Black, Surf, Reef, ...

Add Yahoo as a preferred source to see more of our stories on Google. To that end I’ve put together a handful of the best flasks I’ve used myself over the years that are still available today from ...