Those unused contacts cases that you have in the back of your drawer are great for a weekend trip when you just need a few meds or a couple pair of small earrings to take with you. Since the lids screw on, they are very secure, and they keep out moisture.
This page contains the following solutions.
My granddaughter had scarlet fever a few months ago and her lips were super dry, being so sick. Her doctor recommended Vaseline only on them. She was staying with us but when she went home to be with her mom, she didn't have any Vaseline. I was trying to figure out what to put some in and I remembered I had a full case of unused contact lens cases. I put some in it and it's been the perfect solution.
I tried once to wear contacts. It was a valiant try but didn't work. This left me with a nice little moc croc lens case with nothing to put in it.
Thoroughly clean an old contact lens cases to use for pill box. They keep a couple aspirin or other medications handy in purse or pocket.
It seems like I have more contact lens cases than I need and too many nearly empty tubes of lipstick. Rather than toss everything, I cleaned the contact lens cases well, then filled them with the leftover lipstick.
Earbuds are often small enough to fit in very tiny containers, even a contact lens case. This is a page about using contact lens case as earbud headphones case.