About backpack
A backpack—also called knapsack, schoolbag, rucksack, rucksac, pack, sackpack, booksack, bookbag or backsack—is, in its simplest frameless form, a fabric sack carried on one's back and secured with two straps that go over the shoulders, but it can have an external frame, internal frame, and there are bodypacks.

Backpack

man walking on wooden bridge during daytime
man walking on wooden bridge during daytime
pair of brown leather boots
pair of brown leather boots
black backpack on white box
black backpack on white box
red and black backpack on rock near lake
red and black backpack on rock near lake
woman taking photo of high-rise building beside road
woman taking photo of high-rise building beside road
person in black jacket and black pants carrying gray backpack walking on pathway
person in black jacket and black pants carrying gray backpack walking on pathway
woman walking on street surrounded by buildings
woman walking on street surrounded by buildings
black backpack on snow covered ground
black backpack on snow covered ground
green and black backpack on brown wooden log
green and black backpack on brown wooden log
grayscale photography of backpack on chair
grayscale photography of backpack on chair
blue and beige camping backpack
blue and beige camping backpack
black backpack on white textile
black backpack on white textile
man standing in front of rail
man standing in front of rail
woman in white long sleeve shirt with red and black backpack
woman in white long sleeve shirt with red and black backpack
black hiking backpack near white Fujifilm instax mini camera near black leather boots, red half-zip jacket, gray pocket watch on white map
black hiking backpack near white Fujifilm instax mini camera near black leather boots, red half-zip jacket, gray pocket watch on white map