Sports/Gym bag - best one?

[dancemb]

For years I have had this quite large gym sports bag by Reebok that is very sturdy and quite thick texture, but now the zip will only do up one way and comes undone the other way round, so im now looking for a replacement.

Trouble is, all the replacement bags that I am looking at are really thin and when you put the holdall down, it collapses, where my current one doesnt, they are all so thin that I can imagine all my clothes getting soaked through the thin fabric if it decided to rain.

Does anyone know where I can get a decent replacement with thick fabric like my Reebok one? I dont mind paying upto around £30 for a sturdy & reliable one.