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!

Cap is conveniently attached to the neck so it can't be lost
Antibacterial treatment

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

Volume: 600ml/20.3 fl oz.
Dimension: 5.91 x 9.45 inches
Weight: 0.9oz/26g