I generally carry two bats with me. Lower grade (G3/G4/Butterfly) bat for practice and wet pitches. Higher grade (G1) bat for personal use. Most of my 40over team members tend to have their own kit, but 20over team is notorious. People use others bat during practice, break the bat and silently leave it on the side and escape from the nets. By the time the bat owner finds the bat, everyone would escape from there and leave the owner to fume over his broken stuff. For this reason i keep my G1 bat inside the car and carry it only for matches. For practice i prefer to use butterfly bat.