For INDOC you should bring only what is on the list provided by KP. For other items as a plebe after INDOC, it will depend on your company and your cadre. Regarding your own computer and iPad, I would advise against it as a plebe. Anything you want to connect to the academy server will have to be scrubbed by the IT department. The more devices you have, the more tempted you will be to do things other than studying. I have never heard of anyone with a mattress topper. As a plebe, you want to blend in with the rest of your class as much as possible. Most plebes sleep on top of their made bed so they can save time and pass inspection. As I recall, there should be suggestions in your reporting package for calculators which often change from year to year. Just make sure you are familiar with the calculator you bring because you won't have any extra time to play around with it once you're there. Good luck!