This particular bag has a 24-litre volume. It is made from polyester.
Lenovo B730 Urban Backpack for 17 Inch Laptops, 24L Water Resistant Rucksack with Anti-Theft Compartment and Charging Port – Charcoal Grey
Lenovo Urban B730 notebook case 43.9 cm (17.3") Backpack Charcoal -
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lenovo 17inch backpack b730 gx40x54263 - eet01