The Osprey ThrULite Pro 40 is built for long trail days with a compact overnight kit. Its ventilated vest-style harness spreads the load across the shoulders, while a flexible aluminium frame transfers weight to the padded hipbelt.

The roll-top and taped seams help keep trail weather out. Keep the 5 L lid on for extra storage after a resupply, move it to the harness or hipbelt for access on the move, or remove it with its straps and the top compression strap to cut weight.

Technical specifications

• Capacity 40 L (2,441 cu in), plus 9 L of external storage across the harness, hipbelt and pack body.
• Recommended load 4.5–15.9 kg (10–35 lb).
• Pack weight S/M 760 g complete or 688 g stripped. M/L 810 g complete or 721 g stripped.
• Dimensions 75 × 33 × 30 cm (H × W × D) in both sizes.
• Fit and suspension Unisex fit with 4 in (about 10 cm) of torso adjustment. A 5.5 mm 7075 aluminium LightWire U-frame and Atilon framesheet support a ventilated AirScape backpanel, BioStretch vest harness and padded ErgoPull hipbelt.
• Materials NanoFly body fabric uses 80% recycled 70D high-tenacity nylon and 20% 100D UHMWPE double ripstop. The base uses 63% recycled 100D × 70D high-tenacity nylon and 37% 100D UHMWPE ripstop. The lining is recycled 210D nylon. The body, base and lining have a water-repellent finish made without PFAS.
• Trail storage Large front stash pocket, dual-access cinch side pockets, two hipbelt pockets, trekking-pole attachments and lower gear lash points.
• Hydration Harness pockets fit two 500 mL soft flasks or one 700 mL sports bottle. An internal HydraClip holds a compatible reservoir. Hydration accessories are sold separately.