Freezing food is one of the most convenient ways to preserve meals, reduce waste, and save time. But if you've ever pulled a glass container out of the freezer only to find it cracked, you know the frustration. The good news is that Glasslock containers are designed to withstand freezing temperatures—when used correctly. In this guide, we'll explain how to freeze food in Glasslock containers without cracking, covering everything from choosing the right container to proper thawing techniques.
Glasslock containers are made from tempered soda-lime glass, which is highly resistant to thermal shock. However, even the best glass can break if subjected to sudden temperature changes or improper handling. By following a few simple rules, you can safely freeze soups, stews, leftovers, and meal prep portions in your Glasslock containers without worry.
Why Glasslock Containers Are Freezer Safe
Glasslock containers are crafted from high-quality tempered glass that can endure extreme temperatures, from the freezer to the oven. Unlike ordinary glass, tempered glass is heat-treated to increase its strength and resistance to thermal stress. This makes Glasslock containers ideal for freezing, as they can handle the expansion that occurs when water-based foods freeze. However, it's important to note that not all glass containers are created equal. Glasslock's robust construction gives you confidence that your containers will last through many freeze-thaw cycles.
Additionally, Glasslock lids are designed to create an airtight seal, preventing freezer burn and keeping your food fresh. The lids are made from BPA-free plastic with silicone gaskets, which remain flexible even at low temperatures. This combination of durable glass and reliable lids makes Glasslock a top choice for freezer storage. Whether you're using the MHRB-180 Glasslock Handy Rectangle 7.5 cups for portioned meals or larger options for bulk storage, you can trust the material to perform.
MHRB-180 Glasslock Handy Rectangle 7.5 cups
- Tempered glass resists cracking from thermal shock
- Airtight lids prevent freezer burn
- BPA-free and safe for repeated use
Step-by-Step Guide to Freezing Food in Glasslock
To freeze food safely in Glasslock containers, start by cooling your food completely before transferring it to the container. Placing hot food directly into a cold glass container can cause thermal shock and lead to cracking. Allow soups, stews, casseroles, and other cooked dishes to reach room temperature first. Then, fill the container leaving about an inch of headspace to accommodate expansion as the food freezes. Overfilling is a common mistake that puts pressure on the glass walls and can cause breakage.
Next, seal the container with its lid and label it with the date and contents. For extra protection, you can place the container on a flat surface in the freezer and avoid stacking heavy items on top until the contents are fully frozen. When you're ready to thaw, transfer the container to the refrigerator overnight or use the defrost setting on your microwave. Avoid placing frozen Glasslock containers directly into a hot oven or under running hot water, as rapid temperature changes can compromise the glass. The OCRT-090 Glasslock Oven Safe Rectangle 3.5 cups is perfect for freezer-to-oven meals, but always thaw first before reheating.
OCRT-090 Glasslock Oven Safe Rectangle 3.5 cups
- Cool food completely before freezing
- Leave 1 inch of headspace for expansion
- Thaw gradually in the refrigerator
Common Mistakes to Avoid
Even with durable glass, certain practices can lead to cracking. One common error is stacking heavy frozen containers on top of each other, which can create stress points. Instead, arrange containers in a single layer until frozen solid. Another mistake is using glass containers that have chips or cracks—these weak spots can propagate in the freezer. Always inspect your Glasslock containers before use and retire any that show damage.
Also, avoid using metal utensils to scrape frozen food from the glass, as this can scratch the surface and weaken it over time. Stick to wooden or silicone tools. Finally, don't forget to leave headspace. Foods with high water content, like broth or fruit, expand significantly when frozen. Without enough room, the lid may pop off or the glass may crack. By following these simple precautions, your Glasslock containers will remain in excellent condition for years.
- Don't stack heavy items on unfrozen containers
- Avoid using containers with chips or cracks
- Always leave headspace for expansion
Best Glasslock Containers for Freezing
While all Glasslock containers are freezer safe, some shapes and sizes are more convenient for freezing than others. Rectangular and square containers stack efficiently in the freezer, saving space and keeping your freezer organized. The MHRB-370 Glasslock Handy Rectangle 15.0 cups is excellent for bulk freezing of soups, chili, or large batches of sauce. For smaller portions, the OCST-040 Glasslock Oven Safe Square 1.5 cups is ideal for single servings of leftovers or baby food.
If you frequently freeze liquids, consider using containers with straight sides and wide openings, which make it easier to remove frozen blocks. Glasslock's oven-safe range also allows you to go from freezer to oven (after thawing) without transferring to another dish, saving you time on cleanup. For meal prep enthusiasts, having a variety of sizes ensures you always have the right container for the job. Remember to always use the corresponding lids for a tight seal, and if you need replacement lids, Glasslock offers Rectangle Lids and round options separately.
- Rectangular containers stack efficiently
- Wide openings make removal easier
- Oven-safe models transition from freezer to oven
Freezing food in Glasslock containers is a safe and efficient way to preserve your meals, reduce waste, and simplify meal prep. By cooling food before freezing, leaving headspace, and thawing gradually, you can prevent cracking and enjoy the durability of tempered glass for years. Ready to stock your freezer with reliable containers? Explore the MHRB-180 Glasslock Handy Rectangle 7.5 cups for perfectly portioned freezer meals that go from freezer to lunch with ease.
