The Flaria brush is great for portability.

It is a mini-sized brush. It comes with five different types. I do brown makeup, and it is great for applying different shades. The bristles are soft, so it applies smoothly. The best thing about it is its mini size, making it easy to carry around. Also, it comes in a container, so it is hygienic. It can be inconvenient to pack a separate set when traveling, but this is really convenient.