I have a little v-notch that I can hang my bow on from the waist belt of my pack. I don't know what to call it other then that, it is a little clip that is "v" shaped (you can find in in the archery section at Sportsman's), the string balances on it and I don't have to hold it. I have one on both sides of my pack this way, my hands are free for my binocs.
Setting up a spike camp and doing day hunts from that point is a great idea if you know the genereal location of game. Sometimes it is nice to carry the whole load though if you decide to jump drainages or if you see an animal at closing time and want to stay close.
I usually set up a camp and hunt from there because water is so scarce. Carrying a 60lb pack while hunting just plain stinks, especaily in an old burn.
As far as a cache goes, it is a no-no. But, I like to just throw a rope in a tree and hang whatever in garbage bag or two. Just use a tree with a tight canopy, something small that a bear won't get into or will have a hard time. A jar of peanut butter or a can of Spam sure taste's good until you can get some fresh protein!