As one of its daily deals, 1Sale offers the TYLT Energi+ 10,400mAh Laptop Backpack in Black, model no. BPBL-T, for $79.99 with free shipping. That's the lowest total price we could find by $70. It features five external pockets, two internal pockets, a 15.5" laptop compartment, soft-lined tablet compartment, and 10,400mAh Li-ion battery that purports to provide four full smartphone charges or one full tablet charge. Deal ends today.
Note that this item has an estimated shipping time of two to three weeks.