Glass containers let you see the food, go from fridge to microwave or oven, and do not hold stains or smells. Stainless steel containers are lighter and unbreakable, which makes them better for lunches, kids and travel, but they cannot go in the microwave. Most plastic-free kitchens use both: glass at home, steel on the go. Check the lid, since many lids are still plastic.
Food storage is where most kitchen plastic lives, and where heat and fat make the material choice matter most.
Side by side
| Glass | Stainless steel | |
|---|---|---|
| Microwave | Yes (base only) | No |
| Oven | Ovenproof glass, within limits | Some steel bases; check the maker |
| Weight | Heavy | Light |
| Breakage | Can chip or shatter | Practically unbreakable |
| See contents | Yes | No |
| Stains and smells | Resists both | Resists both |
| Best for | Leftovers, meal prep, reheating | Lunches, kids, travel, picnics |
Borosilicate or soda-lime glass?
Borosilicate glass handles temperature changes better and is common in lab and premium kitchen glass. Tempered soda-lime glass is tougher against knocks but can shatter if it does break. Both are fine for storage; follow each brand’s temperature guidance.
Look at the lid
Many glass and steel containers come with polypropylene or silicone lids. If you want to go further:
- Stainless steel lids for steel containers.
- Bamboo or wooden lids with a silicone seal for dry goods.
- Beeswax or cotton wraps over bowls. See our first plastic swaps for more.
Our take
Use glass for leftovers you will reheat, and stainless steel for anything that leaves the house. Keep food that is still hot out of plastic lids until it cools.
Next, choose a plastic-free water bottle or browse food storage.
Common questions
Can glass containers go in the oven?
Borosilicate and tempered glass bases rated as ovenproof can, within the maker's temperature limit. Lids usually cannot. Avoid sudden temperature changes such as freezer to hot oven.
Can stainless steel go in the microwave?
No. Metal containers should not be used in a microwave. Transfer food to a glass or ceramic dish to reheat.
Are silicone lids plastic-free?
Silicone is not a conventional plastic, but it is a synthetic polymer. Many people accept food-grade silicone lids as a practical step; fully plastic-free options use stainless or bamboo lids.
Which is better for the freezer?
Both work. Leave headroom for expansion and use straight-sided glass to reduce the risk of cracking.