We’ve all known for a long time about soap and shampoo bottles that can be put to use in the classroom holding glue, water, whatever. Having just started wearing contact lenses, we’ve discovered another: the cleaning solution bottle. Smaller in size than soap bottles, with a flip top cap that won’t get lost, these are great for glue, but you may want to use a small drill bit or a red-hot nail to make the hole larger. Anyone who wears contact lenses goes through this solution regularly, so have them save the bottles for you.