L.C.
I got a plastic tote and put their toiletries in it. They just pick it up and head to the bath house - everything is in one place -- toothbrush, soap, shampoo, etc. I also send flip flops for them to wear to the shower... they can shower in them and not step on the shower/bath house floor.
I got monogrammed towels for them. It's so much easier to keep track of those that way. Lands' End has them and they are terrific!
Rain gear is essential. I send a rain coat, umbrella, and Teva sandals -- they usually allow Tevas because they have a back strap. If your camp doesn't allow Tevas, send water shoes. Those will work just as well.
Put in an extra trash bag for dirty laundry.
When we get home from camp, I don't bring the trunk past the laundry room. Everything gets washed immediately - and believe me -- it needs to be washed ASAP! Oh the stench!!
I send the yuckiest socks and underwear. If the socks and undies are totally filthy when I pull them out of the trunk, they get tossed immediately. I still think the kids must walk around camp in their socks!
Send a book to read - they do have down time. There was one camp, (I think it was a music camp at a local college) my daughter called me on the second day and asked me to bring more books. That was an excellent camp, but after the kids spend all morning in rehearsal, they just wanted to rest and read during their afternoon free time... she read! I brought a stack up and she and her friends passed them around like trading cards!
Don't forget the sunscreen and the bug spray!!
LBC