Long ago I realized that my memory was getting to be far from perfect. I sat down and made a list of all the things I take on a hunt, as each item is put into the pack/duffel it is checked off the list. I run thru the the check list a second time as gear is loaded into the truck, a list with all items checked off is pretty good assurance that I've taken the essentials. The list is also handy when leaving camp to make sure everything makes the trip home.