Quick answer

To freeze soup and leftovers in Stasher bags without leaks, fill the bag no more than three-quarters full, remove excess air, seal the Pinch-Loc seal completely, and lay it flat in the freezer. This flat-freeze method prevents leaks, saves space, and helps you thaw safely later. Always use bags designed for freezer storage, like Stasher's platinum silicone bags.

Why Silicone Bags Are Ideal for Freezer Storage

Stasher bags are made from food-grade platinum silicone, which remains flexible at freezer temperatures and won't crack like some rigid plastic containers. This makes them excellent for silicone bag freezer storage. Unlike single-use plastic bags, they can be sealed airtight with the patented Pinch-Loc seal, reducing the risk of freezer burn. The non-porous surface also doesn't retain odors or stains, so your soup won't taste like last week's curry.

Choose the Right Stasher Bag for the Job

Different leftovers call for different bag sizes. For individual portions of soup or sauce, the Pocket Bag (4 fl oz) is perfect for small amounts like pesto or baby food. For larger batches, the 8-Cup Bowl holds a full head of lettuce or several cups of soup, and its leak-free design makes it a reliable choice. The Stand-Up Mid Bag (56 fl oz) is ideal for bulk freezing—think big batches of chili or stock—and its standing shape helps prevent spills while filling. Match the bag to the volume you're freezing to avoid overfilling and leaks.

Step-by-Step: How to Freeze Soup and Leftovers Without Leaks

Follow these steps to ensure a leak-free freeze every time.

Step-by-Step Guide to Leak-Free Freezing

  1. 1. Cool leftovers completely: Let soup or leftovers cool to room temperature before bagging. Hot food can create steam, which turns to ice crystals and causes freezer burn. It can also weaken the seal if the bag is sealed while hot. Checkpoint: Food should be no warmer than room temperature to the touch.
  2. 2. Fill the bag no more than 3/4 full: Leave headspace for expansion as the liquid freezes. Overfilling can force the seal open or cause the bag to burst. For soups, use a ladle or funnel to avoid mess. Checkpoint: The bag should still be flexible and not stretched tight.
  3. 3. Remove excess air: Press out as much air as possible before sealing. Air leads to freezer burn and takes up space. For flat freezing, gently flatten the bag with your hands, pushing liquid toward the seal while pressing out air. Checkpoint: The bag should look flat with no large air pockets.
  4. 4. Seal with Pinch-Loc: Run your fingers along the entire seal to ensure it's completely closed. The Pinch-Loc seal is designed to be airtight, but any food particles or liquid in the seal can cause leaks. Wipe the seal area clean before closing. Checkpoint: Tug gently on the seal to confirm it's secure.
  5. 5. Freeze flat: Lay the bag flat on a baking sheet or freezer shelf. Flat freezing silicone bags stack easily and thaw faster. Once frozen solid, you can stand them upright or stack them to save space. Checkpoint: After 2-3 hours, the bag should be frozen flat and rigid.
  6. 6. Thaw safely: Thaw Stasher bags safely in the refrigerator overnight or in a bowl of cold water. Never thaw at room temperature for more than two hours, as bacteria can multiply. For quick thawing, submerge the sealed bag in cold water and change the water every 30 minutes. Checkpoint: Thawed food should be used within 3-4 days if refrigerated.

Product Facts

  • Pocket Bag: Pocket Bag: 4 fl oz capacity, 3.5 x 4.5 x 1 in dimensions, lightly frosted for discretion, made of endlessly reusable food-grade platinum silicone, no BPA, BPS, or lead. Ideal for freezing small portions of soup, sauce, or baby food; the compact size and airtight seal prevent leaks and freezer burn.
  • 8-Cup Bowl: 8-Cup Bowl: largest in the lineup, leak-free thanks to patented Pinch-Loc seal, easy to clean, perfect for storing full heads of lettuce or other veggies. Great for freezing larger batches of soup or leftovers; the leak-proof seal ensures no mess in the freezer, and the bowl shape is easy to fill and stack.
  • Stand-Up Mid Bag: Stand-Up Mid Bag: 56 fl oz capacity, 8.5 x 7 x 3.5 in dimensions, stands upright, perfect for bulk shoppers, coffee connoisseurs, marinade masters, and kitchen drawer pack-rats. Ideal for freezing big batches of soup, stock, or chili; the standing design makes filling easy and prevents spills, while the large capacity reduces the number of bags needed.