NEW MEMBER OFFER!

Get 35% off GOES, your essential outdoor guide

LEARN MORE

GET MORE WITH OUTSIDE+

Enjoy 35% off GOES, your essential outdoor guide

UPGRADE TODAY

Anker

Anker 2nd Gen Astro 6400

For the size and weight of an energy bar (and the cost of a box of them), you get 6,400 mAh (enough for four iPhone 4 charges).