It depends on the lunch box. My children have two different types of Sistema lunch boxes and they fit in them but I guess it depends on how much food you put in the lunch box.
Product Details
Long Lasting Lunch Box Ice Packs
KEEPS FOOD FRESH AND CRISP
The hard ice pack is ultra slim and compact, but still powerful, a gel filled ice pack retains coldness much longer than ordinary water injected ice packs.
SLIM AND LIGHTWEIGHT
They measure 13cm as a square – like a small sandwich, so fit in all lunch box types. They weigh the same as a few slices of bread, you’ll hardly notice them!
MULTIPLE USES
Ideal for school lunch box ice packs, office lunch bag, or a day out in the sun, fishing trip, hiking, camping or just for those longs drives in the car. It will keep your food cold and fresh for many, many hours so you can enjoy it fresh and tasty.
TRUSTED BRAND
Buy today and get a 100% money-back promise within 30 days. If you’re not satisfied with our product we don’t deserve your money, as simple as that. No questions asked.
THIN, SLIM AND EASY CLEAN
These fit right inside your lunch box and stay colder than our competition – because it’s a gel based, rather than a water based coolant!
SLIM AND LIGHTWEIGHT
They measure 13cm as a square – like a small sandwich, so fit in all lunch box types. They weigh the same as a few slices of bread, you’ll hardly notice them!
Quick Q&A
Yes they do give off a little condensation, but it's not a signficant amount.
Yes that wouldn't be a problem, they contain 'SAP' which is a chemical very similar to that found in a baby nappy. Always check with the airline in advance however, as they may not be happy with an unknown chemical.
Yes, that's exactly how they are designed to be used. You can leave them in the freezer until you are ready to use them. Our record is 3 years in the freezer with no adverse effects!