Osprey Ace 50 is a 50-litre hiking pack designed for young trekkers, built to the same standard and with the same features as Osprey's adult packs. The pack has an adjustable back length (33–46 cm) and a Fit-on-the-Fly hipbelt that can be extended, allowing it to grow with the child across several seasons. Recommended age is approximately 8–14 years, and the maximum recommended load is approximately 11 kg.

The ventilated AirSpeed suspension system with a LightWire wire frame and mesh back panel keeps air circulating against the back and distributes weight effectively.

The pack is top-loading with a removable lid and features a dedicated zippered sleeping bag compartment at the bottom with a removable divider, an internal sleeve for a hydration system, two mesh side pockets, a large front pocket, and hipbelt pockets. Compression straps and an integrated rain cover are included.

The material is recycled nylon with a bluesign-approved, PFC-free water-repellent treatment. Weight: approximately 1.7 kg. Dimensions: approximately 71 × 33 × 30 cm.