This is pretty much an insulated version of the popular Unbottle bag. Perfect when you need insulation for your drink, either from the cold or heat. A hanging loop helps in drying the bladder. - Includes a Crux 2L bladder with hose, valve and Big Bite Valve - The bag and hose housing are insulated - 600 denier surface fabric endures use - On/off valve - Bladder: 10 year guarantee, protective bag: 2 year guarantee - The cover bag itself only weighs 160 grams, and the combination of the bag and a full bladder weighs 2910 grams