I use to carry a bag full of crap (have two bags full actually). By the time I quit gigging I had a key in my pocket-no bag. I always brought two sets of sticks, and brushes or mallets only if I needed them. I brought some tape-which I can use to hold stands, or tone down a cymbal, or tone down a tom. And I'd bring any charts I had written for complicated stuff. That's about it. Less stuff to carry the better.