• 100% Polyester. • Length: 16.5in. • Width: 10.5in. • Depth: 6in. • Internal hydration storage pocket and drinking tube retainer. • 0.5gal bladder included. • Highly reflective printed panels in strategic zones for enhanced visibility. • Hardwearing polyester fabric. • EVA foam and comfort airmesh shoulder straps. • Air mesh back construction to allow ventilated airflow. • Adjustable sliding chest harness. • Mesh stash pockets. • Zipped front pocket. Regatta - Blackfell III 5.3gal Hydropack Knapsack