I'll admit my motives for up cycling are mostly selfish. We take our own trash to the dump and recycling is a pain (we don't have single stream recycling) to the more trash I can keep out of the can the less often we have to go to the dump.
With the dogs we go through dog food like there is no tomorrow. I also hate the idea of adding more plastic bags to the landfill than I have to. As a result I turn the dog food bags into grocery totes. They are reusable and (best of all) they don't rip when wet! I use Rebecca Nickols tutorial found here.
I like to save them up and then do a bunch of them at a time ... usually when the bags begin to take over my craft room. Here is the haul for today!
They are also available for sale at my Etsy shop.