Freezing beans! Particularly black beans, my fave.
Here's how I cook em up, no soaking. http://eathealthyeathappy.com/how-to-cook-black-beans-from-scratch/
Then I portion them into freezer bags, either 1 1/2 cups or 3 cups in a bag. So it's equivalent to a can or two cans. So convenient, and a lot cheaper than buying cans!
Speaking of hacks, here's a whole bunch I got together from some awesome bloggers. They're all vegan (except one gal wanted to demonstrate making sushi, but I thought that was okay because all-veggie sushi is awesome).