Comment by wonger_
Plastic deli containers for food storage: https://a.co/d/0ne7FfI ($26)
Good for portioning leftovers. No more guessing which tupperware to grab - you either have a big one, a small one, or a combo. Only one type of lid. Stackable, freezable. Mildly disposable - easy to give food to friends or throw out forgotten fridge nasties. Good for holding ingredients during cooking, like a blend of spices or spare water. Not good for reheating, though.
If you want something a bit heavier duty, check out cambro. For example: https://www.webstaurantstore.com/cambro-rfs1ppsw3190-1-qt-tr...
One downside of plastic food storage in general is that I find it doesnt seem to rinse as clean as glass, ceramic, or metal in the dishwasher (obviously a lot of variables there).