From earlier years, one great piece of info was SPACE BAGS. You can find them lots of places. (The huge ZipLoc-type of things you hook a vacuum cleaner to and it squishes things down / takes the air out).
They are great for Indoc packing (if stuff gets dumped out, you just have a few bags to collect...) Actual zip loc bags in bigger gallon-sized ziplocs for the little stuff / shaving /etc you'll have.)
My S packed it all in a seabag, and looked like a turtle with his home on his back.
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By the way , start/keep running every day.
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Did we bring too much ? yes. Is2day/Less-is-more is correct.
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He also did the same thing packing for 1st Sea Year term. Everything fit in about 2/3 of his sea bag. He was trying to figure out what else to take along, to fill the bag up. Don't know what he decided, but part of my DVD collection was 'tactically obtained'.

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Go down the list of items in your ReportingIn/Indoc packet.
Make copies of papers. HAVE a copy with you.
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(an aside) Make front/back copies of your IDs (Drivers License/Passport/Credit cards).. makes replacing them easier if you have the info. We haven't (knock on wood).
Start/keep running, every day.
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Bring your A-game, and a CAN-DO attitude, and a sense of humor.
It's short, but intense. You WILL survive it.
Bring your gritty determination as well... you will need it for stay focused on academics.
You have signed up for an incredible journey... All Service Academy kids have. It will NOT be the same as your other friends going to State U.
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BTW, your parents are in for an incredible journey as well
Hey, did I mention... start/keep running, every day ?!
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Congrats to all the incoming Plebe Candidates !