Product Parameters
Unisex backpack in black with a roll-top design. The material is water-repellent fabric, described as waterproof Oxford nylon and polyester. The capacity is 20 liters. Dimensions are 42 cm high, 29 cm wide, and 16 cm thick (also stated as 29 x 16 x 43). Fits a 15.6-inch laptop. Features adjustable shoulder straps, a chest buckle, and a top carry handle.

Key Features
Designed for daily urban use with a roll-top closure described as anti-theft and expandable. Large main compartment with snap button closure and drawstring, intended for carrying office and travel essentials. The front strap is reinforced with metal rivets for added security. A rear zippered pocket is intended for small items such as a phone or wallet.

Applicable Scenarios
Suitable for office use, commuting, campus life, and travel. Can be used as a school backpack, travel bag, everyday backpack, or hiking backpack, for activities such as work, meetings, shopping, weekend trips, and outdoor activities.

Product Summary
A black 20L roll-top backpack with water-repellent material, space for a 15.6-inch laptop, and practical compartments, made for commuting and short trips with a clean, unisex look.