As nouns the difference between rucksack and bookbag
is that rucksack is rucksack, backpack while bookbag is a bag for holding books for school.
rucksack
English
Noun
(
en noun)
a bag carried on the back or shoulder, supported by straps
Synonyms
* back pack or backpack
* knapsack
* haversack
* packsack
bookbag
English
Noun
(
en noun)
A bag for holding books for school.
Synonyms
* backpack
* satchel