Based on this product's specifications, here are some alternatives and similar models
Backpack XDDESIGN P706.2801 Urban water-resistant 20L, 15.6" laptop compartment, Black
Summary description:
XDDESIGN P706.2801 Urban is a water-resistant 20 L backpack in black designed for everyday commuting and travel. It features a lockable main slider, a padded notebook compartment for devices up to 39.6 cm (15.6"), and a total weight of 755 g. Practical for work or study, it protects electronics and keeps belongings organized. Warning: keep out of reach of children.