M-Edge International Tech Backpack with Battery (BPK-MT-N-GO) Integrated battery provides 4000 mAh charging capacity to power your device on the go Io Charge port lets you Charge your tablet or phone while on the move Large zippered front storage pockets and interior storage Battery provides an additional 25 hours of battery life for most smartphones and 8 hours for most tablets Fits most 15 inch laptops