Since the lockers in the clubs only about 60 are still deep. is a decisive criterion for this bag.
Okay you fit without squeezing in the locker, both in the gym and in the pool!
Next question: What fits in
Here is the list:
1x slippers 43
1x sports shoes 43.5
2x towels
1x towel
1x set of underwear
1x set of jersey (Sport shorts, jersey, sports socks)
1x shower stuff
1x diverse small items (headphones, padlock)
1x beverage bottle 0.5 liter
For me therefore perfectly adequate:
Now you can decide