A flat bottom is really nice for things you don't want to get squashed, and you can stack things like cans and boxes and lettuce, or whatever you need, plus it can make it easier for storage if it lies flat. I also appreciate bags with an interior pocket, like our best pick overall...
with this one. Wash lettuce and shake out as much water as you can in the sink. Then place the greens in a plastic grocery bag that has been lined with a paper towel. Grab the handles and spin the bag in large circles in the air. After several whirls, you'll have dry lettuce. ...