19 inches is the average size of a regular backpack
The size of a Standard video file depends on the size of the media used to create it.
There is no standard size for any school.
The standard CD size.
the standard ipod headphones are about the size of a penny or a dime.
It is 75% of a lot - however big that is! A "lot" is NOT a standard size.
They are roughly the same size as a normal school backpack. However, they can be a bit smaller as well. Also, they can be comparable to a hiking backpack.
The standard size postcard is 4" X 6".
The size of any standard CD-ROM that you have in your house.
13 gallon is a standard household kitchen trash bag size.
It means Standard, which is basically a one-size-fits-all kinda thing.
The Osprey Argon 110 (7100 cu.in in size large) and the Greggory Denali 105 (7000 cu.in. in size large) ar ethe two biggest available online.
If it's a huge backpack, you can usually leave it on the side next to the tracks. But usually there are pockets in the cars big enough to stuff your backpack in.