Ultralight backpack Osh Ultra 85L

An ultralight backpack designed for expeditions where minimizing gear weight is critical. Perfect for ascents of any difficulty level, lightweight technical trekking, as well as long-duration or winter trips.

Thoughtfully engineered details combined with premium Ultra 100; fabric and a minimalist design make this model unique in its weight-to-strength ratio.
Backpack weight: 760 g.

Design Features

Minimalist Concept

• Clean design — nothing catches or interferes while climbing

• Perfect bag geometry

• Made from a single continuous fabric panel with minimal seams — reduces weight and increases durability

• Ultra 100; fabric provides an exceptional strength-to-weight ratio

• Roll-top closure system: easy to roll, convenient volume adjustment, can be used without the lid

• Volume adjustable with top compression from 45 to 85 liters

• Large back-panel pocket for a sleeping pad or removable back insert

• Two large stretch side pockets that fit a 2L bottle

• Removable internal zip pocket (15×15 cm)

• Ergonomic removable top lid (pack weight without lid: 640 g)

• Lid can be opened with buckles both from the front and back side

• Two pockets inside the lid

• External attachment points on top of the lid

• Soft dual-component hip belt for better hip fit; can be tucked behind the back panel when not needed

• Hip belt includes two spacious pockets

• Optional gear loops for carabiners available upon request

Compression & Gear Attachment

• Modular webbing loop system allows extensive external gear attachment (crampons, ice tools, rope, sleeping pad, skis, etc.) using compression straps

• Ice tool attachments designed to keep tools tightly secured against the pack

• Includes 6 compression straps, 70 cm long and 10 mm wide

Additional Details

• Ergonomic shoulder straps distribute weight efficiently and allow full freedom of movement while climbing

• Shoulder strap webbing runs continuously through the pack bottom — enhancing structural durability

• Each shoulder strap includes 3 gear loops (one large vertical, one small vertical, and one horizontal loop for plastic carabiners such as Petzl Caritool)

• Slim profile — does not extend sideways and interfere with climbing

• Tubular shape allows expansion up to 85L when needed

• During summit pushes, the half-loaded pack remains compact and the rolled top does not interfere with a helmet

• Original vertical carry handles on both sides

• Both handles are load-bearing and allow the pack to be clipped to an anchor or used as a mini haul bag

• Vertical orientation is convenient when wearing belay or insulated gloves

Hardware

• Buckles — Woojin Plastic

• Triglides and zippers — YKK

Weight

• 760 g

• 640 g without lid

• Optional metal frame available upon request (+90 g)