Rolls up small when empty Extra durable, with the ability to hold boiling water Tapered design to easily fit in running vest pockets Attaches to filters with a 28 mm thread, like the Sawyer Squeeze Tethered cap The HydriamX is a soft, collapsible, reusable drinking flask made in Cnoc's eXtra durable, thicker TPU. Like the Cnoc VectoX, the HydriamX is capable of holding hot liquids, making it the perfect vessel for your warm beverage of choice. Whether it holds your favorite Après-ski cocktail, gets tucked into your sleeping bag as a hot water bottle, or just gives you extra durability, the HydriamX is the extra tough, ultralight flask you’ve been looking for. The HydriamX comes in three different volume sizes, allowing you to fully customize your set up to your needs. All three sizes feature a tapered design that allows them to easily slide into the pocket of a running vest. The back includes markings for measuring out liquids while cooking or mixing your favorite camp cocktail. The narrow mouth HydriamX uses a 28mm thread and is compatible with 28mm filters like the Sawyer filter range, the Platypus QuickDraw, and the HydroBlu VersaFlow, allowing for filtering on the go during long runs or fastpacking trips.