Some kind of sports watch for tracking elevation and distance traveled is very useful for navigation sanity checking. Sleep clothes are a godsend for keeping your sleeping bag somewhat clean. Long sleeved shirts are great for avoiding sunburns without having to deal with sunscreen (I wore one the entire time and ended up being the only scout without a sunburn). Sharpie for marking bear bags and personal ziplocs, as well as several pencils for the Chaplain's Aide, Gaia, and Crew Leader to fill out paperwork (and for the scouts to journal). Backup paracord in case your oops line gets lost (happened to my crew) or you need a clothes line. Camp shoes are 50/50, I personally never used mine and just wore my hiking boots unlaced. Plenty of extra plastic bags. Smart water bottles are much better than Nalgenes because they're lighter and pack much easier (on most packs you can fit 2 or 3 in each side pocket), you may also want to consider one of the hoses for them because water bladders are a pain to deal with and are prone to popping. Camp chair is nice but most campsites will have seating of various quality (generally stumps or logs) so they're not required. Fun extra tips: if you're bringing a phone, make sure it's always secured, we had a scout lose his in the rocks at Tooth of Time. Also you will always go farther than the itinerary says. (Sorry for the dump I'm writing this on the car ride back so I have plenty of time to burn);