my new one bag, 20L for travels up to 2 weeks. two bottle holders with extra support, can pack 1.5L x2. plus isothermal bottom section for food. Decathlon. : r/onebag
Rockrider Hydra Bag 900 Backpack Black | Alltricks.com
Forclaz Men's MT100 Easyfit 70 L Backpacking Backpack | Decathlon