Inflatable Life Vest for Kids

One of my must have travel items is probably also one of the strangest things I travel with. It's an inflatable life jacket for kids. You never know where you might end up that doesn't provide a life vest. This was the case everywhere we went in Honduras. No one had a life jacket at any of the places we went, but it didn't matter because we had our own.
This is the exact inflatable life jacket we travel with for our kids. It takes up almost no space at all in your suitcase. It's easy to blow up and it's held up well. I initially thought because it's plastic that it would last long, but it is very durable. It also dries easily, because it's plastic you can simply wipe it down with a towel.

This life jacket has been to Hawaii, Honduras, Florida, and so many more places with us.

Do you have a strange item you always travel with?