I have a cousin that braids them and makes shower mats.
Or perhaps you are planning an escape, saving them to make a rope for rappeling out the window?
I use them as liners for several wastebaskets around the house; also I use a cut-off one gallon plastic bottle with a grocery-bag liner as a "garbage bowl" on the kitchen counter. Throw food scraps and other countertop waste into it, then tie the bag off and throw it in the garbage under the sink a couple of times a day.
If I had to pay for the bags I probably wouldn't do it, but since they're "free" it's OK.