All the cans can be packed in a box of 6. But, if i have 1 can of carrots (for ex.) it has 13 uses, I can open it and 13 times and as a result I have 13 opened cans of carrots.
If I have just 1 can of carrots... I can pack it in a box of 6. Open the box of six and I have 6 canned caroots cans. If I repeat the process... I will have infinite cans of carrots. :)))))