Next time you finish a carton of milk, don't flatten and toss it; instead, open up the spout and use it to hold leftovers and scraps. Since the container is waxed, it won't leak. However, it will eventually break down at a composting facility, so once it's filled, you can drop the entire container, compost and all, in your curbside composting bin. Waste not, want not!
Want to upgrade your container? Check out these choices below.
Source: Flickr User numb3r