The large sleeve will hold a single 3 litre bladder or two 2 litre bladders. closes via two adjustable fastex clips and dues to its size it can also be used for long item storage. Designed to mounted on the back of large platfroms such as the D/A Armour cover or chest Rig back. Includes drainage grommets at bottom for water operations and external attachment points for small pouches. Requires four MOLLE colummss for attachment.