The Mens Exos 38 Rucksack from Osprey is a lightweight, well-ventilated backpack that is ideal for multi-day trips. Thanks to its clever, no-compromises design and with the removable lid and integrated FlapJacket, you can travel lighter and faster. With its advanced AirSpeed back system and ExoForm harness and hip belt, you can dial in the fit for a more comfortable, ventilated load-carrying experience so your back can breathe even while you push on harder with whatever adventure you are on.