HydraSleeve™ 3L Insulated Hydration ReservoirHydraSleeve 3L is an insulated hydration reservoir for users who need to carry water outside the pack and keep it cooler for longer. The outer sleeve is made from waterproof 210D ripstop nylon with welded seams, while the 3L Elite reservoir inside gives it a durable base for regular outdoor use. Foam insulation with a reflective liner helps slow heat transfer in warm conditions and four lash points make it easy to secure the reservoir to different