It's called a shower cap. Again, this is something that I do not need.

浴帽，也是我用不上的东西。

Well, it's not exactly a hat; it's a shower cap.

好吧，这不完全是一顶帽子；这是一顶浴帽。

I only wash my hair every other day so I put on a shower cap and don't have to get out my shampoo and conditioner.

我每两天洗一次头，洗澡的时候戴上浴帽，也不用拿洗发水和护发素出来。

Louisa emptied Will's backpack, revealing every free hotel shampoo, conditioner, miniature sewing kit and shower cap she could lay her hands on.

Louisa 清空了 Will 的背包，拿出她可以拿到的所有免费酒店洗发水、护发素、微型针线包和浴帽。