They look like alternatives on a shop page and they are not. Mesh and roll-top solve opposite halves of the same problem.
Mesh, for wet kit going home
Wide-gauge mesh on five sides drains standing up and dries on the journey. It is the right bag for everything that comes out of the pool wet.
Roll-top, for dry kit going in
A roll-top keeps the changing-room floor out. Phone, keys, a dry hoodie and the club card go in there and come out in the same condition.
If you are choosing one to start with, choose mesh — the wet problem is the one that ruins car seats. The dry bag tends to follow within a season.
