I've had a few, including some of the nice leather dopp kits. But now, with all the travel restictions, charges for checked bags, and stricter weight lmits, I have pretty much settled on one of these simple L.L. Bean gear bags.

They are light, well thought out, functional and cheap. They are also soft and mold into whatever space you have in your bag, unlike stiffer leather. And besides, if you just have carry-on, you need the liquids in a ziploc bag anyway.

I know, it takes the "romance" out of having a beautiful traditional leather rollup, but if it is air travel you need the bag for, you need to be practical nowadays.