I've done a few supported tours and am trying to mentally go through my checklist. Beyond the obvious (enough shorts, jerseys, socks, athletic bras to get me through the trip), I bring cool weather gear, e.g., arm warmers, knickers, a light rain jacket, full finger summer weight gloves. Are you staying in a tent? If so, I would suggest bringing a flashlight or, better yet, a latern of some kind. That comes in handy for me in getting ready in the morning and reading at night. I also find that a compression bag for dirty clothes (and often wet) is pretty handy. I bought one at a local camping store. I also bring a camping pillow that folds up small enough to fit in my duffel bag. Ear plugs and a eye mask are also helpful for getting a good night's sleep.

Because packing space has always been at a premium on my tours, I pack using "Space Bags." They serve several purposes. Obviously, they help you pack more in a small bag. They also help keep your clothes dry and organized. I use a large duffel bag for my tours and things would otherwise gets so jumbled and disorganized if I didn't put things in smaller bags. I keep cycling clothes in one and street clothes in another, bras, panties, socks and the like in a third. I also make good use of zip lock bags to organize all of my gear and personal items. Again, it just helps to stay organized when you're trying to get ready in a tent in the morning.

Beyond that, just remember lots of chamois cream, sunscreen and the like. I also bring a small clothes line just in case I need to dry something I'll need again.

Have fun. Where are you going?