Leak-proof small insulated milk container recommendation for my daughter’s lunches to save money?

[u/Pretend-Read8385]

I keep wasting money on individual milk and juice boxes because every container I’ve tried leaks and ends up making a mess in her backpack and ruining her papers from school.

School lunch is free, except she is picky and won’t eat it and you can only get milk if you take the whole lunch. It’s ridiculous, but it is what it is.

Ideally, I’d like one container with milk for lunch and another for juice with her snack.

She’s 10 and cool now, so no rainbows or unicorns.

Links would be appreciated. TIA

[u/North-Cover5411]

I think a lot of the vacuum insulated sealing types recommend not to use with milk because if you forget about it, it will pressurize as it warms up and begins rotting (fermenting?). Idk what the real risk is but I think at least Yeti warns against it. If you still want to, I’d recommend Klean Kanteen. They’re lighter weight and not designed for “macho men” like Yeti so probably easier for a kid to open. They also have lids where only silicone (gasket) and stainless steel will touch the liquid.

[u/pfp-disciple → u/North-Cover5411]

Maybe reusable "ice cubes" would help ensure the milk stays cold? I'm thinking of the small plastic reusable ice cubes.

[u/FayeSG → u/pfp-disciple]

Alternatively freeze some milk in cubes, and add a couple of those to the liquid milk to keep it cold.

[u/One-Possible1906 → u/FayeSG]

Makes weird fat chunks when it thaws though, a picky kid probably won’t touch it