The Trent PowerPak Ultra keeps USB-based devices charged while outdoors. It features a rugged exterior and an IP-67 waterproof rating for protection against drops and immersion. With 14,000 mAh of power, it offers several times the capacity of a smartphone battery and charges any combination of phones, tablets or other USB devices. $69.95. New Trent, Fremont, Calif., (510) 226-6268.
April 2014 issue