20,000
Amazon sells a variety of baby back packs. Some are in fun animal shapes and others are just smaller versions of adult back packs! They have many options at very affordable prices.
372,000,000
generally they are sold in 4, 6, 8, and 12 packs. sometimes they are in 20 and 40 packs for parties.
72 = 6 x 12
according to Dave Hitt at: http://www.davehitt.com/2005/reasonableconclusions.html about 30 billion packs are sold annually in the U.S.
60,000
6 X 4 = 24 toilet rolls in 6 packs.
80
16 packs would need to be bought for 64 toilet rolls :)
6
Last year, it was restricted only to 2 packs, but I think 1 carton is the highest amount which can be sold to Germany