I've been asked numerous times about the stuff I carry around when meerkatting.
Below are some of the supplies I find most valuable. Many of the below are Amazon affiliate links, so if you click through them, I might be able to buy a snack (costs you nothing extra). Disclaimer that some of the items were sent to me for free... But I wouldn't recommend something I don't use & believe in.
GET A GOOD BAG.
I'd link to mine if I could find it (I'd love to buy a backup). I prefer walking around with a messenger bag as opposed to a backpack. Built in cable routing is important as well, to run from your battery to the phone.