Luggage and bags:
Anything goes so bring whatever suits your style and the type of your trip.
Clothing/Shoes/Weather Gear: Shorts and good comfortable shoes for walking around will be a good idea. Bring a jacekt or something warm for night. Even if it's 110 in the day it will get cold at night.
Toiletries and Medical Supplies: Bring whatever you need because you're a long way from just about everything and this is not a good place to get stuck without something. There are stores here and there but they may not have what you need.
Miscellaneous: You're going to need water so bring lots of it. Be prepared and don't expect to find it at the store because there usually isn't a store when you need it. During the hot months of summer wyou will do nothing but sweat and drink water so it's better to be safe than sorry.