I tend to carry way more than I really would have to, but I don't mind. The property I hunt is not that large, and carrying a small pack not difficult. I load the pack to cover just about anything I might want throughout the season, and then I don't need to worry about having what I want that particular day. It's all just small stuff though. Things like a drag rope, pair of rubber gloves, notebook and pen, predator call, lens cleaner, extra tab, extra bow rope and bow holder, knife, toilet paper, folding saw, etc. I don't use everything on every trip, but I always have what I might need, and it doesn't take much to carry.
Depending on the weather, I might stuff in an extra vest or maybe rain gear.