What should I bring to volunteer at an animal shelter?

Okay, so recently I became a volunteer for a local animal shelter. I've went for the new volunteer training, and now I'm ready to go whenever I have time (obviously within the shelter's hours) as long as I sign in. Since I plan on going a lot, since I really enjoy it and it is close to home, I was going to keep a bag just for the stuff I want to bring to the shelter. The only thing is I'm not really sure what to put in it. I know I need to bring a hand sanitizer, but is there anything else I should bring? The shelter has everything for animal care, obviously, so nothing like cat/dog brushes and toys, 'cause that would be unnecessary. Do you guys have any idea?

Honestly, you don't really need to bring anything.Maybe some money to eat something (if there is a vending machine there) and a pen if you are going to be working with anything that has you writing stuff.Each shelter is different. My shelter already has hand sanitizers everywhere and they have a water filter so I only bring my phone, some cash and a pen.