Here is the manufacturer's information:

FEATURES
Quick access to the side camera
Laptop sleeve suitable for checkpoints
Magnetic tote handles
Weatherproof zips
Expandable water bottle/tripod pocket
Secure passport pocket
Removable camera protection

SPECIFICATIONS
Material: Waterproof tarp and Robic 1680D Ballistic Nylon. Weatherproof zips.

PRVKE 21
Dimensions: 43 X 28 X 17 cm (17 "H X 11 "W X 6.5 "D)
Volume: 21 L to 25 L (top roll fully extended)
Weight: 1.3 kg (2.8 lbs)
Laptop sleeve dimensions: 33 X 24 X 2.5 cm
Tablet sleeve dimensions: 32 X 24 X 1.25 cm