A backpack—also called knapsack, schoolbag, rucksack, pack, booksack, bookbag, haversack, packsack, 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 or internal frame, and there are bodypacks.
Backpacks are commonly used by hikers and students, and are often preferred to handbags for carrying heavy loads or carrying any sort of equipment, because of the limited capacity to carry heavy weights for long periods of time with hands.
Description:

Water-resistant and high-density fabric make this bag durable for storing and carrying items.
High-density fabric makes this bag highly durable for storing and carrying items.
Open-top design, collapsible design, two handles for easy storage and carry around.
Lightweight.
 
Material:
Durable Water-Resistant Polyester.

Safety standards:
Material test: CPSIA & Prop 65 for lead and cadmium. Phthalates (7P). AZO.
 
Product size: (LxWxH)
31 x 13 x 40 cm.