The North Face Surge II Charged Daypack - Ink Blue/Sulphur Spring Green Fully integrated battery system allows routing to Joey battery from multiple pockets Joey battery pack offers up to two-and-a-half full phone-battery charges and several days of partial charges Rugged ater and crush resistant lithium polymer battery pack Volume: 32 Liters (1953 in?) Weight: 3 lbs 3 oz (1445 g)