Bcb adventure jetstream 3l reservoir hydration system description jetstream 3l reservoir features large 52mm opening with handle lining closed cell foam lined pouch to help keep the contents cool or warm shoulder straps lightweight shoulder straps are removable so the system can be attached to the larger packs yokes and makes it asier to fit into your rucksack fabrics polyamide fabric available in multicam coyoteblack attachments 6 d rings and 4 side