Gregory Arrio 28L Backpack Review - Stretchy Hip Belt for Comfort The Gregory Arrio 28 is a lightweight, ultra-ventilated daypack built to disappear on your back for long day hikes and fast trail missions. Full review. In this review we break down the Gregory Arrio 28 — a lightweight (just over 2 lbs) day-hiking pack that nails the sweet spot between minimalist efficiency and all-day comfort. The star is Gregory's VaporSpan tensioned back panel: a suspended, engineered-mesh system that holds the pack off your back for serious airflow and body-mapped support, so you skip that cold, sweat-soaked back at the summit. Add an ultra-flexible CloudControl hipbelt that moves with you, a breathable harness, and genuinely smart organization, and you've got a 28-liter hauler ready for big day hikes, peak-bagging, and "might as well keep going" missions. Rated to carry up to 25 lbs, and also offered in a Plus Size fit. What we get into: ✅ VaporSpan suspended-mesh back panel — airflow & mapped su...