Hmm must haves.
Take what you can to make your life comfortable and enjoyable. For me that’s electronics. A gaming laptop, mouse, game pad, a Nintendo switch. Those are my musts in addition to regular packing things (underwear, overnight shirt, ball powder).
Another must that someone else posted... a multi port usb charging station. Mine has five ports. Normally I use two... one for my phone and efb. I have used all of them before... phone, efb, watch, noise cancelled ear buds, switch.