Pack yak

The Pack yak is a level 96 Summoning familiar. It is summoned by using a Pack yak pouch, which will give 4.8 Summoning experience. Apart from being able to temporarily hold up to 10 items for a player, it also has a special move called Winter Storage, which can be activated with a Winter storage scroll, which banks a random item in the pack yak's inventory if it's full.