Mountainsmith Scream 55

The Mountainsmith Scream 55 packs 55 liters of capacity — a 50-liter main body plus a 5-liter roll-top extension — into a removable aluminum-stay frame weighing just 1270 grams, a genuinely low figure for this volume class. An air-channel back panel prioritizes ventilation over the more common contact-padded designs seen elsewhere in Mountainsmith's lineup, and load-lifter-equipped shoulder straps combined with a fixed, padded hip belt (fitting 71–122 cm) handle load transfer. The 210D Robic HT nylon body pairs with a 610D Cordura base and a DWR water-resistant finish. Access is via roll-top plus front panel J-zip, with two zippered front pockets, two stretch-mesh side pockets, hip belt pockets, a daisy chain, and side compression straps. It supports up to a 3-liter hydration reservoir, though there's no integrated rain cover. At roughly 23.1 grams per liter, this is the most weight-efficient pack in the Mountainsmith lineup here, built for thru-hiking and multi-day trekking of about three to five nights where minimizing base weight matters.