Portable battery to recharge your cell phone.
Awesome in these 2 scenarios:
At hostels, you can toss the battery and your phone in a locker to charge it while you sleep / shower / etc. Otherwise you're left leaving it out to charge in the open near an outlet where it's at risk for theft.
On trains/buses/etc without power.
I like this Anker 6000mAh one because it has a nice balance of size/weight/# of charges.
I like keeping my pack light, so the middle option seemed best for me. Also, over time, as the batteries lose some capacity, it should still be good for at least 1 full charge. This particular model also uses very high quality rechargeable batteries unlike some cheaper brands.
Not sure what happened the last time. But here it is again... the desktop charger is %12 off which is a pretty good deal.
Anker sale from there website. Some prices seem pretty awesome.
Enter the code OFF2COLL at checkout and get 12% off on desktop chargers (prices reflect the discount):
Anker 40W 5-Port Desktop Charger with PowerIQ™ Technology (White) $22.99
$25.99 - $3 coupon (OFF2COLL) = $22.99
Enter the code FOMO2014 at checkout and get 20% off the following products (prices reflect the discount):
Anker 36W 4-Port Wall Charger (White) $15.99
$19.99 - $4 coupon (FOMO2014) = $15.99
Anker 2nd Gen Astro 6000mAh External Battery with PowerIQ™ Technology (Black / Yellow / Green) $20.79
$25.99 - $5.2 coupon (FOMO2014) = $20.79