IKEA 365+ Stainless Steel Food container with Airtight Lid

The solution to your overflowing tupperware drawer! They stack, go in the dishwasher, the oven, are light, and are completely leak-proof (eg, bring to work soup without worrying about it spilling in your bag). I have 5 and convinced all my friends to buy them too: now whenever we bring each other food or have leftovers from dinner parties, we can simply swap them. The wood lids look nicer, but the plastic is much more practical (and doesn't actually touch the food). Way more affordable than other similar options.

Bonus: Because it is airtight, you can even use it in a pinch to turn heavy cream into whipped cream. Simply pour in, snap shut, shake, and voila!