The bladders went into the freezer overnight so we could see how they might handle being accidentally left in the car overnight in winter ... Teton Sports Oasis 18L Hydration Pack with 2L Bladder ...

Whether you’re training for a marathon, tackling your first ultra, or heading for a day out on the trails, a hydration pack can help you carry all the essentials you need in one place.

The snow sports one doesn’t have any of the extra add-ons other than hydration to keep the chest pack as lightweight ... and Accessories for Your Favorite Winter Sports and Activities.