Back in the 90s, almost every kids' lunchbox came with a matching thermos to keep hot food in. Now, you typical need to purchase a thermos separately. But, they still make a great container for keeping hot things hot. Thermoses come in many shapes and sizes. Some are meant only for liquids (such as coffee), while others are designed to hold food. If you're packing lunches, or heading out for the day, a thermos can be a great way to add some variety. Here are five of the best thermoses. Thermos Stainless King 16 ounce Food Jar with Folding Spoon Comes with a Folding SpoonKeep your food hot for up to seven hours. Best Overall Find on Amazon Tired of sandwiches in your lunches? This thermos will open up a lot more options for hot food on the go. Since it features thermos vacuum insulation technology, it will keep your food hot for up to seven hours, and cold for up to nine. When you put your hot food inside, the outside of the thermos will remain cool to the touch. It’s also sweat proof when used for cold foods. The wide mouth top is easy to fill, and eat from. The lid doubles as a serving bowl, and there’s a folding spoon attached, which is convenient. The thermos is leak proof if you put the lid on tightly. You can add up to 16 ounces of food, which makes it a great size for portability and portion control. Pros Convenient serving bowl and spoon Wide mouth top Includes folding spoon that stores well Cons The lid can be hard for children to open Stanley Classic Vacuum Insulated Wide Mouth Bottle The Classic Green ThermosThis classic thermos can hold over a quart of liquid. Most Iconic Find on Amazon When you ask someone what a coffee thermos looks like, chances are fairly high that they’ll describe this one. It’s a tall, green thermos that has a classic feel. There are three different sizes available, ranging from just over a quart to two quart. This holds a lot of liquid, so you can fill it once and have it last all day long. Literally. Since it’s built from BPA free materials that insulate extremely well, this thermos can keep your hot liquids hot for up to 24 hours. It also works for cold liquids if you prefer. The lid doubles as an eight-ounce cup. When you put the lid on tightly, the thermos is leak proof. Pros Made from durable 18/8 stainless steel Large capacity Lid works as a cup Cons Will need to use a brush to clean the inside Snug Flask for Kids – Vacuum Insulated Water Bottle with Straw Fun Colors and a Built-In StrawHelp your kids stay hydrated with this fun thermos. Most Kid Friendly Find on Amazon If you’re looking for a kid-friendly thermos, this is a great choice. There are several fun color options and patterns available, including unicorns, llamas, and taxis. The lid features a push button opening. When you push the button, the lid pops and a straw is revealed. The straw is bent for easy use. The 12-ounce size is perfect for smaller hands to hold on their own. There’s a carrying ring included, which many kids prefer. You can use this thermos for hot or cold liquids, so send chocolate milk, hot tea, or anything else your child enjoys for them to drink at lunch. Pros Kid friendly design options Great size for kids Easy to use push button top Cons Leaks when open MIRA Lunch Food Jar Triple Wall Vacuum Insulation Your food will stay perfectly hot or cold in this thermos. Brightest Color OptionsFind on Amazon You’ll have a harder time losing these brightly colored thermoses. They come in a variety of great colors, so pick your favorite. The 18/8 stainless steel is durable, and rust-proof. You can hold 13.5 ounces of food in this jar, which is enough for an entire meal. The triple wall design and innovative technology helps your food stay at the right temperature for hours. It keeps hot food hot for five hours, and cold food cold for ten. The wide mouth top is easy to fill, and easy to clean since you can reach inside with a wash rag. Pros Bright colors Holds enough food for a full meal Triple wall vacuum insulation Cons You can put the seal in upside down, which makes it very hard to open Energify Vacuum Insulated Food Jar An Easy to Open ThermosWith a unique air pressure release button, this thermos is easy to open. Most InnovativeFind on Amazon When you add hot or cold liquid to most thermoses, they create a build up of air pressure inside. This can make opening the lid extremely difficult, especially for children. But, this thermos has a unique air pressure release button. You simply push it a few times before opening. Letting some of the air pressure go makes it simple to twist open. This thermos comes in a few fun colors, and each has a silicone loop for easy carrying. The lid turns into a bowl, and there’s also a spoon for easy eating. It holds a generous 17 ounces. Your hot food will stay hot for up to twelve hours, and cold food will stay cold for up to 24 hours. Pros Easy to open Fun colors The lid doubles as a bowl Cons The seal comes off easily, which means it could get lost Frequently Asked Questions How do I use a thermos? For best results, read the directions that came with your thermos. That way you can check for any special directions or anything. Most thermoses call for you to preheat them. To do this, add hot water to your thermos and let it sit for 10-15 minutes. You can do this while you heat the food to put in it. Then, dump out the water. Add your food and quickly seal the lid. If you leave the lid off for too long, the food will cool down. Whenever you’re ready to eat, unscrew the lid. Then, you can access the food or drink inside. When you’re done, seal it back up. What foods can I send in a thermos for my child to eat at lunchtime? You can use a thermos to hold a variety of foods. Some favorites include chili, soup, casserole, and mac and cheese. Typically, foods that can mush together a bit inside the thermos do better. But, they really can hold almost anything. What size thermos do I need? You want a thermos that works for you. If it’s too big, there will be extra air space inside which can cool the food or drink down faster. But, if it’s too small, you won’t have enough when it’s time to eat or drink. So take the time to imagine yourself using a thermos. What do you see yourself keeping inside of it? Do you want to fill it up once and forget about it? Or do you just need one to take for part of your lunch? When you start to answer these questions, you’ll be able to decide what size thermos you need to purchase. Related posts: The Best 5 Dog Harnesses The Top 5 Frisbees The 5 Best Blankets for Dogs