Watchtower Laptop Backpack - 15 Corsair Blue Ballistic. Escape to your favorite destination with this JanSport Watchtower laptop backpack. It features multiple inner and outer pockets to quickly stash or access items. This 15 inch laptop backpack also features a tricot-lined tablet pocket to keep your tablet safe. Carry snacks and beverages for your journey in the insulated storage compartment and side water bottle pocket. You can use the carabineer key clip to hang additional travel gear. To lend this adventure backpack a sporty style, it features genuine leather trims and the classic JanSport label.