Frozen yogurt survives if you pre-chill the container

Pack the frozen yogurt or popsicle in a small insulated container that you’ve pre-chilled in the freezer, then surround that with a freezer pack in a lunch box. The container matters more than the pack.

A wide-mouth thermos or a kid’s insulated snack jar works best. Throw it in the freezer empty for a few hours before packing. That way the cold walls are already doing work, not just the dessert. Put the frozen thing in last, right before they walk out the door, and close the lid fast.

Air is the enemy. The less empty space inside the container, the longer it stays frozen. If you’re packing a popsicle, break it in half or tuck it into a small freezer-safe bag before it goes in. For frozen yogurt cups, pop the whole sealed cup in the thermos—no need to transfer.

The freezer pack is just backup. You want it on top of the container, not underneath, because cold air sinks. And skip the big insulated lunch box if it’s not also pre-chilled. Toss a second freezer pack in there overnight and you’re set.

If you do that, any decent insulated container will keep things frozen until lunch. The expensive ones just do it longer, but most kids eat fast enough. Future You won’t have to hear about the dreaded puddle.