It's a little disconcerting to put dirty clothes directly into the bag at the gym or on the road ... A "washable laundry bag" that solves that problem is now available at the 100-yen shop "Can Do".
Approximate size is 35 x 40 cm, with plenty of gusset 20 cm, and a laundry bag with a handle that you can carry by hand. By closing the zipper on the top, it can also be used as a laundry net that can be washed without damaging the laundry.
There have been similar items in the past, but the difference is that the mesh has a double structure . Since the contents are hard to see through and you can carry your underwear with confidence, it seems to be good to change clothes and carry around at hot springs. Why don't you get it for your spring trip or Golden Week season?