This insert is composed of (2) main trays. The bottom tray is designed to hold the game tiles and villain minis. It contains 1 inner tray to add organization to the smaller connecting tile pieces. The top tray holds sleeved cards. It has (2) inner trays to hold the various bits and has enough room to hold an additional die set. The insert will hold the Han Solo, Chewbacca, Rebel Troopers, Rebel Saboteurs, R2-D2 / C3-PO ally packs and the General Weiss, Royal Guard, IG-88, Boba Fett, and Kayn Somos villian packs. The (2) inner trays are also designed to additionally hold the cardboard tokens from the Return to Hoth and Twin Shadows expansions. There is no nee to purchase the Imperial Assault I Trays with this version. They were created for those that purchased this insert prior to 3/12/2016. Also, if you purchase this and Imperial Assault II at the same time, you can use "impassaultcombo" coupon code to receive $15 off.