I made the storage comb. It is a comb with a twist. There is an hollow handle where you can store shampoo or other necessities that takes up space. I thought of this design after watching astronauts in space carry around what looked like a plastic bag full of space shampoo. I wondered “what could save space and be efficient?” And then I thought of design. I have a very wide base with many bristles for efficiency. The handle can hold anything from shampoo to even toothpaste. I think you’ll love it.