If we don't have any projects for the day, sometimes I'll stay out the entire day. So I bring a day pack with water, a book, lunch, flashlight, binoculars, and a beer or two to go along with my gun, knife, and a layer or two of clothing. Radio for if I get hurt, but it stays in the pack generally.
I hike just over a mile to the stand each way instead of taking a vehicle because I can always use the exercise. I'll occasionally get out and stalk a bit if things are dead. I don't feel like it's too bad of a deal to bring a backpack.