Blizzard has announced that, once Wrath of the Lich King comes around, mounts and vanity pets will no longer take up space in your bag or bank. How are they doing this? By turning them into summoning spells, of a sort.

Here's what Nethaera had to say about it:

Players will be able to “learn” a mount or non-combat pet much like learning a spell, recipe, or new ability, and these creatures will then show up on a new Pet tab within the Character Info section of the interface. Players will be able to access and preview their learned mounts and vanity pets through this tab.

Once learned, the pet icon or mount icon will no longer appear in bag spaces or bank spaces. This inventory space will be made available once again for other adventuring needs. Pets can still be set to hotkeys by dragging them to the hotkey bar, much like any other spell or ability.

That certainly gives you more reason to keep them in your bank rather than deleting them, even if you lose the storage space that comes with it. In any event, waiting a couple more months shouldn't be a problem, and there are always bigger bags for you to buy now.

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