Made a fort kit for a little boy's birthday gift recently. Started off with a drawstring bag that I bought at Joann's and added a little heat transfer personalization. There are several blogs and Pinterest pictures out there on fort kits right now. I liked THIS one and THIS one best.
A couple of sheets with ties I sewed on each corner.
Clothespins and a bag to keep them in, glow bracelets, a flashlight. I've also seen suction cups with little hooks on them, but couldn't find any for my kit.
Happy Birthday, Noah!