Each package comes in its own cardboard box, inside of which is the regular plastic box containing the game, and the steelbook which is another plastic case with a steel front and back. As well as the images on the front and back, there are images on the inside which can be seen through the transparent plastic. Like the regular plastic case, the steelbook has a space for one game, but you could obviously fit more games in there if you don't mind them shaking around. I might end up putting some tissue paper inside for that purpose, as it would be a missed opportunity not to use it to store extra games.
I haven't played the games yet, but I plan on playing Omega Ruby first despite Sapphire being my first GBA Pokémon game. This is because I want to see how the story plays out before deciding if I want to recreate my original characters or make new ones. The name I'm going to use for Omega Ruby is one I did use on the original Ruby, but I have since restarted that game and erased the data, so I'm fine using that name again despite what I find out about the storyline. Oh, and I'm going to choose Mudkip first.