Pokemon X Y WalkthroughPokemon XY PokedexPokemon Wii U
Fire Red & Leaf Green: Item Pack
The first pocket in your bag has items that you can find, or that you can buy in PokeMarts. Items like Potions, Rare Candies, Escape Ropes, etc.
The second pocket holds Key Items. Items that you only get one of, such as; the TM case, SS Anne Ticket, Voice Checker, etc.
The final pocket contains the different types of PokeBalls you own.
The TM Case holds all of your TMs and HMs. With this, you can easily view the stats of an attack, before booting it up.