Versatile and high-performance, the Challenger 28 backpack is perfect for climbing, mountaineering, and ski mountaineering in extreme conditions. Made from Challenge Sailcloth Ultra, a lightweight yet highly tear- and abrasion-resistant fabric, it has a roll-top design that allows you to expand the capacity from 28 to 32 liters. Thanks to two practical compartments accessed via water-repellent zippers and numerous removable straps and cords for attaching rope, skis, ice axes, and helmet, you can customize the fit to your needs. Additionally, the back panel has a removable structured insert for greater support with heavy loads, the shoulder straps are fully adjustable, and the hip belt features removable padding for better load distribution and all-day comfort.
TECH INFO Best for: Mountaineering External Dimensions: 29cm x 21cm x 57cm Type of Access: Top Secondary Access: SIDE Rope Carry System: YES Adjustable Harness: YES Alpine Tools Holder: YES Ice Tool Sleeve: YES Skis Holder: YES (A-STYLE & DIAGONAL) Helmet Holder: YES (INCLUDED) Avalanche Compartment: YES Capacity (L): 28+ (Expandable to 32L) PFAS FREE: Yes Other Fabric: Liner : 100% recycled Nylon Main Fabric: Body: Ultra 200 TX / 400 TX: 100% Polyethylene (UHMWPE)
PLUS + Main compartment: PFAS-free Challenge Sailcloth Ultra 400 fabric + Front panel and roll top: PFAS-free Challenge Sailcloth Ultra 200 fabric + Capacity: 28 liters, expandable to 32 liters with the roll top closure system + Main compartment divided into two sections with a drawstring closure + Water-repellent YKK® side zippers for easy access to both main compartments + Removable thermoformed back panel with a structured insert for added support + Hip belt with double D-ring closure, gear loop, zippered pocket, and adjustable and removable padding + Customizable shoulder straps with load adjustment system and sternum strap with integrated safety whistle + Daisy chain with attachment points for helmet holder (included), removable bungee cords, ice axe loops, compression straps, and ski holder + Internal pocket with key clip
NOTE: Accessories for illustrative purposes only - NOT included. Pay attention to the "PLUS" tab for any included accessories.
SUSTAINABILITY C0 DWR (no fluorocarbons), Waterproof 0.5 mil RUV matte film backing, recyclable after use. Challenge’s proprietary
The OP 50 is a mountaineering backpack designed to carry rescue equipment and perfect for use over any mountain terrain.
Who it is for and how to use it
Ideal for
Alpinists and climbers in extreme conditions
Designed for those practising mountaineering and climbing in demanding weather and with technical loads. The 28+ litre capacity and the Ultra 200 TX / 400 TX body focus on durability and gear management.
Those carrying technical equipment and seeking load organisation
Suitable for attaching rope, skis, ice axes and a helmet with a customisable setup. The structured back panel and adjustable shoulder straps help with heavier loads.
Ski mountaineers looking for a technical and durable backpack
Suitable for ski mountaineering, with A-style and diagonal ski carry, water-repellent zips and an avalanche compartment. The UHMWPE construction is designed for harsh use.
Use cases
Ideal
Mountaineering ascent with full equipment
Handles rope, ice axes, helmet and technical accessories well. The internal structure and attachment points help keep the load organised.
Rope · Ice axes · Helmet · Mountaineering
Very suitable
Ski mountaineering tour in challenging weather
The water-repellent zips, ski carry and avalanche compartment make it suitable for technical outings in winter conditions.
