Amazon.com: RAINS Backpack Mini - Grey Waterproof Backpack 。Rare color. Now $110 in website Material: 100% polyester with polyurethane coating Lining: 100% polyester Waterproof rating: W3 – Waterproof protection from light rain Water column pressure: 8000mm Measurements: H40 x W29 x D10cm / H15.7 x W11.4 x D3.9 inches Volume: 9 liters / 2.4 gallons Weight: 888 g / 31.4 oz. Features: Signature carabiner closure Flap with magnet snap fastenings Single main compartment External back zip pocket Internal zip pocket Flat laptop pocket fits 13” device with sleeve – 15 without Adjustable backstraps