found just the right dictionary to fit into his schoolbag.
Examples of schoolbag
schoolbag
I've forgotten his name but the crush was really only on his awesome Ninja Turtle schoolbag.
From the nzherald.co.nz
It is also vital that children carry their schoolbag correctly.
From the telegraph.co.uk
It has the added convenience of being 50% smaller than common spacers, fitting easily into a pocket, purse or child's schoolbag.
From the scoop.co.nz
Unfortunately, my mother, daring to poke fruit into the quagmire of my schoolbag, is daily proof that parental love withstands everything.
From the nzherald.co.nz
Megumi Yokota was last seen pausing at a traffic light by her home in Niigata, a badminton racquet stuffed in a white bag and a black schoolbag clutched in her hand.
From the time.com
More examples
A bag for carrying school books and supplies; "found just the right dictionary to fit into his schoolbag"
A backpack (also called rucksack, knapsack, packsack, pack, or Bergen) is, in its simplest form, a cloth sack carried on one's back and secured with two straps that go over the shoulders, but there can be exceptions. Light weight types of backpacks are sometimes worn on only one shoulder strap.