Here is a copy of a recent email I sent to the all the incoming cadet candidates from Georgia (via the Parent's Club). Keep in mind that you could show up with nothing, and still be fine...
"Many of you have asked about what your candidates might want to carry into Beast Barracks this summer. Several upperclass cadets have compiled this list of things they would take to beast with them if they were going again. NONE of these items is required, and your candidate would survive without them. These are things that can make life a bit easier (or make you popular in your squad!). The suggestion is to pack them in one or two gallon size ziploc bags (except the shoes, obviously) inside the bag to be carried on R-Day. That makes transfer of the items into the "big blue bag" (or whatever they are using these days) they are given on R-Day a simple matter. This list has been used and refined over the past 5 years, and nothing on it has ever been confiscated...
SUGGESTED ITEMS (in additional to your low quarters and athletic shoes):
Electric razor
Wrist watch (sturdy, waterproof, with alarm and glowing dial for reading in the dark)
Alarm clock, battery operated or wind up (see watch – meaningful redundancy)
Small flashlight with extra batteries (mini-mag type w/ red filter for lens)
Small folding multi-purpose tool/knife (Leatherman type)
Small address book (completely filled out, including important dates)
Stamps (put in address book)
One 8x10 frame (plastic,not glass) with various photos in it to rotate, or a collage of photos to fit
Disposable lighter (buy after you fly in -- for burning strings off uniforms, sealing 550 cord, etc)
Chapstick
Small roll of duct tape (sand color if you can find it)
Lengths of 550 (“parachute”) cord
Band aids, blister pads, moleskin, anti-friction gel (also good for use with ruck chafing) and gold bond foot powder (see a theme?)
Lint free rag for shining shoes
Fine grade sand paper for buffing gouges out of shoes
Extra all-white crew socks (you will be issued some)
Toothpaste, shampoo, facewash IF you prefer a particular brand of each
Sports-type wicking underwear (i.e. UnderArmour type)
Extra boot socks (military)
Thin, wicking sock liners for wear under dress socks and/or boot socks
For female candidates: extra sports bras, and a supply of whatever feminine products you prefer (the C-store is limited).
Make certain your athletic shoes are running shoes (not cross trainers, real running shoes), fairly new, but broken in."