...are the empty 100ct mealworm containers they sell at the petstore. Butter containers and plastic Ziploc/Glad containers work well too, but even the smallest ones will seem big to a baby leo.
Cut a hole on the side. Don't make the hole big, just enough for the baby leo to go in. You can guess based on the size of its head. I use moist peat moss as the medium for my humid hides. You can buy a huge bag of it at Home Depot for $3. Pack it down so it's not loose. Then put the lid on and place the hide on the warm side.
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chickabowwow

3.2 leopard geckos (Rosie, Locke, Lisa, Caesar, Tommy)
and 3 eggs a' cookin' 