The Osprey Ace 50 is a 50-liter kids' backpacking pack aimed at roughly ages 8 to 14, built for multi-day treks where a child needs to carry more gear than on a single day hike. The internal LightWire frame combined with the ventilated AirSpeed suspension distributes load and keeps airflow moving across the back.
The Fit-on-the-Fly hipbelt lets you adjust hip circumference on the go, which is practical for kids whose build changes quickly between fittings. Torso adjustability of up to 5 inches covers growth across multiple seasons. At 1670 g for 50 L, that's about 33.4 g per liter — slightly better than the smaller Ace 38. It has one ice axe loop, an integrated rain cover, and is built from 600D recycled nylon with bluesign approval.
It suits families planning multi-day treks with older kids, where some shared group gear needs to be distributed onto smaller shoulders too. Like the Ace 38, it carries a 99-year warranty.