Anker PowerCore Fusion | $21 | Amazon

Our readers’ favorite USB travel charger pulls double duty as a USB battery pack, and you can get one for $21 on Amazon right now, almost $5 less than usual.

I’ve had the Fusion since it first came out, and it quickly became my favorite Anker product ever, mostly because it’s the only Anker battery pack that you can charge by plugging straight into the wall. You can read all of my impressions here, and then head over to Amazon to get yours on sale.