More info:
I realize they keep you in the dark as to what to bring.
You will be issues toiletries, but not a decent tooth brush or deodorant. This sounds funny, but I would bring soap on a rope if you can find it. Besides being funny (in a good way) it will save you precious hand space walking to the head to shower. You don’t need shampoo; you won’t have hair.
If you can go out and but Fox Valley blister-free socks or thorlo boot sockx, that is highly recommended. I wore those without doing the thin inside of thick and my feet were fine. Not doing the double sock method has advantages: time and packing space on long exercises.
You will not need any extra clothes. Maybe an extra pair of pants. Personally, I kept mine in my car until the first libo. I had no problem with the ones I packed getting excessively wrinkled.
Bring extra markers (black) for marking gear. Laundry Sharpies are good. Bring a few black pens, and a couple of red pens (you really only need one, but your fellow candidates will appreciate it if you have a few extras). DON’T pack this stuff away when they put your civilian bag away in the locker.
Ziplock bags are key. Big and small. You will need the big ones with more frequency, though. The small ones are what you will put your paper in for stuff (like a little notebook thingy).
This is pretty much all you need besides what is on the packing list before the first libo I think.