What is in your jiu jitsu bag?
I carry extra stuff like a rash guard, spats, and pants. All things I have forgotten. They've also benefitted a training partner or 2.
Coat hanger in case the string needs to be put back in pants. Underrated accessory.
First aid kit, electrolyte mixes, a protein bar, mouth guard, extra deodorant and usually a toothbrush.