The Evernew Water Carrier can be used as a collapsible water bottle or it can be combined with their Hydration Tube(Sold Separately) to make a backpacking bladder. 
Built in shock cord to keep the bladder rolled up for storage in your pack. 3 Layer system with low oder polyethylene.
With the guesseted bottom, these will stand on their own once filled!

Use as a replacement bladder for your Saywer Sqeeze or Mini water filter!

Ultralight at 1.5 ounces (42 grams)!
Capacity: 2000ml/67ounces
Dimensions: 13 in x 8.3 in