The bag is a tool in most Pokémon games. It holds all of the player's items, storing them for ever until the player uses them all. When opening the bag, the player can use, arrange, and toss all items except for Key items, and register key items for easy access. All the items that the player has on hand will be located in the bag, after Generation two, being placed in the appropriate pocket automatically. Prior to Generation four, the items pocket had only limited spaces for the items, while the other pockets had space for any and all items that would go there. If an item to be picked up would be placed into the items pocket, however, and the pocket was full, it could not be picked up until the player had deposited some items into the PC. This problem no longer exists in Generation four, where the bag has enough room for every item. In of the bag menu, the player will find a list of all their items, ordered by first obtained to the most recently obtained. First is at the top, and Recently is at the bottom.
It is hard to find what you are looking for, because the item names are in small letters and one of the easiest ways are looking at the pictures that is, if you know what they look like. Though you can keep anything and as much as you want is an advantage.
It is mostly the same as Diamond and pearl except the bag is a diffrent color and it has more key items.
It is more organized. There are six items on each page with bigger letters and a picture. And in Heartgold and Soulsilver there are new Poké Balls.