I’ll be testing the HydraPak Stow 1L for the next few months. This is a new product from HydraPac, so new in fact that it has not made it onto the website. It looks to be a cross between the Seeker and the Ultraflask or Softflask lines. I did not receive any literature with the Stow but the mouth piece looks different than the ones I see on the website. It is basically a twist top. To drink, twist it counter clockwise until it pops up. The liquid can be gotten out by either sucking the mouthpiece or squeezing the bottle. Squeezing could be handy for irrigating a wound or if sharing the bottle.
The bottle is oblong shaped. It stands about 9 inches tall, 5 inches wide and 2 inches thick at the widest point. It is too big for most pant pockets but the shape should help it fit more easily in pack pockets than a round hard sided bottle. And by being flexible it will conform to the shape of the pocket better. It also means that when empty it will be collapsible. There is a plastic loop at the top that could serve to hang the bottle but will slide over the rolled up bottle to keep in in a small bundle.
HydraPac states that all their thermoplastic polyurethane (TPU) bottles are 100% BPA and PVC free. Other symbols printed on the side of the bottle indicate it is leakproof, good for water to 140 F (60 C) and is top pack safe. In my opinion, top pack safe is just another way of saying leakproof.
My thanks to Hydrapak and 4alloutdoors.org for this testing opportunty.