What happens when you use the "sports bag"?

hmm... you may just have to use it and find out.. :) Maybe something useful will pop out of it..

I'd look it up or tell you to look it up on subeta.neolodge.com or subetahq.com but both of them are down currently so I'm not quite sure.

They give you a random item with the word "gym" in the item name. One of them can give two, but I can't remember which one.

As Lexiana said. The Stylish Sports Bag gives you 1-2 items.