As nouns the difference between briefcase and rucksack
is that briefcase is a case used for carrying documents (especially by business people while rucksack is a bag carried on the back or shoulder, supported by straps.
briefcase
Noun
a case used for carrying documents (especially by business people)
Synonyms
*
rucksack
English
Noun
(
en noun)
a bag carried on the back or shoulder, supported by straps
Synonyms
* back pack or backpack
* knapsack
* haversack
* packsack