Available only from Hammacher Schlemmer, this is the backpack that helps relieve achy back and shoulder muscles via vibration massage. It has a built-in 5,000 mAh battery that powers the built-in massagers (located at the shoulders and lower back) and also enables the backpack to charge personal devices. Its main compartment provides ample space for books, travel necessities, or a weekend’s worth of clothes, and has an interior padded pouch that accommodates a laptop. It also has four smaller zippered compartments and padded, adjustable shoulder straps. Made with lightweight, durable, and weather-resistant nylon. The backpack’s internal battery charges via USB; a full charge provides up to five hours of massage. 16 1/4" L x 11 1/2" W x 5 3/4" D. (2 3/4 lbs.)