When you are packbacking remember a few things. You are not out there for a long time (mostly five or so days) so pack accordingly. One change of clothes, two changes of socks, your dehydrated food, stove, small pot, water filter and bottle, knives, game bags, rain gear, 4 season tent, sleeping bag and pad, a headlamp, 2 small tarps. , first aidkit, any medicine you take, and your shells is about it. Try to keep your back down to about 85 lbs or so. Three miles is not all that far, and you will probably hike that in a few hours, so you can most likely get away with a heavier pack. Don't overdue the clothes or the food. Think 100 calories per ounce for your food and you can't go wrong.