IMO, not weird at all.
When I was in Switzerland, in the super mkt, you have to bring your own plastic bag ..... and I always forgot so, I put all kind of vegetable in my work bag.
or maybe I'm weird LOL
I think we can use wherever or whenever we want
I used to use my old LVs as gym bags. Afterall they weren't getting much use- just sitting in the dark in my closet. I suppose it would be okay to use Balenciaga as a gym bag. Not tacky at all. Just filthy rich!
i AM currently using my Work as a gym bag but I go get my own locker so its safe and i ziplock my clothes & toiletries -its the perfect size and because i'm out all day - i dont drive- i really dont want to lug yet another bag and my work fits everything perfectly so why not?