I've said this before but I'll reiterate it because it's so important (I think 😜): Having a "gear bag" is crucial for your training "stuff". Shoes, clothing, meals, water bottles, technology----it can all travel conveniently with you.
My bags of choice are my Training Mask bags. One is a quick carry back pack, the other is a long duffel.
Selection should be based on:
1) Personal needs
2) Amount of gear you take with you
3) The amount of compartments/zip pouches you prefer or need.
My wife calls them my "man bags", but I call them a key to keeping it all organized.
You may not need to opt for anything fancy, you can choose based upon your personal needs. Find the best gear bag for you!