The best freezer containers are quart-sized glass jars.

Glass can be an eco-friendly alternative to plastic in the refrigerator, but the jars should be freezer-friendly as thin-walled jars can crack in such cold temperatures. Glass is also less forgiving than plastic when food expands, and breaks more easily than bending. The stainless steel container can withstand freezing temperatures and can be reused indefinitely without leaving behind any odor or taste. They also need enough space to expand and seal the lid.

Glass is an excellent and eco-friendly storage option, but not all glass containers are created equal. This set from Glasslock has thick walls and a sturdy construction that makes it easy to move from the fridge to the microwave or oven. The clear sides allow you to easily see the contents of the jar, and the BPA-free plastic lid has a silicone seal that helps keep air out to prolong the freshness of the contents. With nine containers (and their lids) of different shapes and sizes, you’ll always have the right one for leftover stews and soups, pre-portioned lasagna, and more.

These glass food storage containers are perfect for preparing multi-component meals or storing different parts of a meal. They’re bento boxes with three sections to keep your food from sliding around. However, the lid does not seal the partition. So if you have liquids or something naughty, know that a slight wobble will cause some leaks. They all have the same size, so they can be easily stacked in the fridge or cupboard.

The best freezer containers are freezer bags.

While there are several options, the best freezer containers have airtight lids. This extends the shelf life of your food, provides a better freezing process (frozen products that come in contact with air can sometimes dry out), and sometimes allows you to use the container for other purposes than frozen storage. The airtight cap is also leak-proof, ensuring you can store liquids without spilling.

Reusable freezer containers are certainly an environmentally conscious option, but if single-use options are a must, consider Ziploc gallon freezer food storage bags. They’ve been a convenient, reliable staple in the kitchen for years, thanks to triple-system closures, extended tabs, grip, and double zippers.

Considered by some to be the best freezer container, Foodsaver containers feature the original vacuum and preservation method. Attaching the top valve to the sealer (sold separately) draws air inside, creating an airtight seal that keeps food fresher for longer.

Resources:

https://www.foodandwine.com/lifestyle/kitchen/best-freezer-containers

https://www.thespruceeats.com/best-freezer-containers-5087533