both my parents use their keepalls as gym bags..they put everything in there (sweaty clothes, swimwear, food) and i think they look.., athletic/fashionable..lol
I think it's perfectly fine if you use big bags as your gym bag and as long as the design is suitable for anything...it's possible...dont u think??
btw, they had the bags since like..10 yrs ago and it's still in excellent condition except for the handle(got brownish coz of water/sweat lol) and it doesnt smell at all.