Bring what is on the list. It is difficult to fit it all into the one bag you are allowed to bring, even with the boots hanging on the outside.
Besides what was on the list, we stuffed in as many pairs of underwear as would fit. My son has about two weeks’ worth so he doesn’t need to do laundry too often. There are requirements about color, so make sure yours comply.
Also good black socks and boot socks are really helpful to bring because the standard issue ones are not as nice. My son likes the black socks from Feetures (high performance crew) and the coyote brown boot socks (6074) from Fox River. I mailed him a bunch more pairs of the black socks because he said they are the most useful ones to wear.