Click here for additional gel ice pack ideas. There are a variety of ways you can make gel ice packs for your lunch box. It's ideal to double-wrap this DIY ice pack, so it doesn't leak as it melts. The sandwich bag won't freeze solid, so you can shape it to fit your lunch box. Seal it closed and place it in the freezer. This gel ice pack is great for school lunch boxes because all you need to do is fill a Ziploc bag with some dish soap.
#REUSABLE ICE PACKS FOR LUNCH BOXES HOW TO#
Want to learn how to create the coldest ice pack for a lunch box? Read more details about how to make your homemade ice pack colder and last longer. You can even do both salt and rubbing alcohol if you desire. When mixing, use about one cup (8 ounces) of water and four tablespoons (two ounces) of isopropyl alcohol for a 4 to 1 ratio. However, you have to make sure your bag is sealed to avoid contamination. You don't want isopropyl alcohol going through your lunch box. Isopropyl alcohol (or rubbing alcohol) also lowers the freezing temp in ice packs and you can use this instead of salt. Salt water can stay as low as -9✬ (16✯) compared to regular ice which will stay at just 0✬ (32✯). If you want your ice to stay even colder add more salt than this. Consider a 12 to 1 ratio of water to salt. Instead of filling your Ziploc bags with regular tap water, add salt for a colder result. But you can do it with salt you have in the cupboard. In ice packs you buy from the store they use salts or other fillers to lower the freezing point of their ice packs to achieve this same effect.
#REUSABLE ICE PACKS FOR LUNCH BOXES FULL#
Why? Because salty water has a lower freezing and melting temperature compared to regular water. Your salt ice pack will start out just as cold as a regular block of ice but as it begins to melt it'll stay at a colder temperature for longer than regular ice would.įor full details read this detailed article about the actual reason salt makes ice colder. No matter which DIY ice pack method you try you can make sure your ice pack stays colder than it otherwise would by using salt water. Make Your Ice Pack Colder With Salt and Rubbing Alcohol So if you need to keep something frozen for longer these are a great option.Ĭheck out the best DIY ice pack ideas for your lunch box, and you can have one ready for the morning. Extras like dish soap, rice, hand sanitizer, or a sponge can make for even better lunch box ice packs depending on your needs.Īdding salt or rubbing alcohol will help your homemade ice pack stay colder than a regular ice pack would. Fill up the sandwich bag with water, place inside another sandwich bag and freeze.
If you want a DIY ice pack for your lunch box all you need is water and a sandwich bag and a freezer. Instead of spending your hard earned cash on one, you probably have the few items around your house that you need to make your own ice pack. You want to make a quick, easy and cheap ice pack for your lunch box.
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