Our pantry shelves don't go all the way to the floor, so there was a lot of wasted space that could be used. I bought a few plastic drawer sets and adjusted the shelving so that the drawers fit underneath. I use the drawers for items like bags of beans, granola bars, and microwave popcorn. It makes snacks more accessible to the kids and is a great way to organize items that don't stand up or stack well.
Most of the drawers are labeled. The two drawers with Post-its on them are for "rotating items", such as the last few juice boxes from a larger package. By having a few drawers to catch the lasts of things, you can free up space for the full replacement.
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Several years ago, I purchased a craft cart with tons of drawers, for additional storage. The cart itself started being too flimsy to use, but the drawers were in perfect condition. I decided I'd try to use them to organize my pantry, and I love the outcome! I labeled each drawer using my label maker and tried to sporadically place the different colors on the shelves.