Each faction in dune gets its own little box for their forces, leaders and other tokens. You can use those to give each faction the spice for the start of the game. In doing this, you only have to hand out the mini boxes to each player, and you are ready to go.
The Insert also can provide space for the mini figures of the deluxe version of the game, like the one you can buy here on the wellplayes website. Perfect match.