A Large Rucksack, or backpack, is necessary in the Zombies mode for Call of Duty: Modern Warfare 3 to simply carry more stuff on your character. There are plenty of items and schematics to pick up, so it is best to be prepared with more portable storage.
How to Get a Large Rucksack in Modern Warfare 3 Zombies
There are two ways to get a Large Rucksack in the Zombies mode: getting the item as a reward for completing contracts and purchasing it from the Buy Station. One requires a lot of luck, while the other requires better gear and weapons before tackling.
