Go here and scroll down until you see Maxperks. (see pic below)
Click where the arrows are pointing to get to the Maxperks page. There you will see the 100% backpacks and totes link as well as the $0.01 batteries link.
There were 7 bags/totes to choose from as of this post. The limit is 2!
The batteries are Duracell 10 or 20 packs of AA or AAA batteries that are $8.48 or $14.28, with all but $0.01 back in Maxperks rewards. Limit 2.
Here's an idea. Planning on buying a Kindle or digital camera soon? Get 100% back in rewards items for the amount you plan on spending. Then, in a month, when your rewards come, buy it with the rewards! You'll have what you were planning on buying plus a bunch of free stuff!
Get started here!