While many of EXPED's alpine mountaineering packs will double as ski/snowboard packs due to their versatile designs (snow-sliding tools are frequently used when taking on mountaineering objectives, after all), snowsport-specific packs are better for many outings. Mountain Pro 20, Glissade 25 and 35 and Serac 25, 35 and 45 are each designed specifically to accommodate skis and snowboards and related gear. 
For lift-assisted riding, most folks find the 20-liter range to provide enough volume to support a day of resort skiing with some side-country (lift-assisted backcountry, AKA out-of-bounds) runs thrown in for good measure. On fully human-powered backcountry trips, more volume is required to carry extra clothing, food, water, etc. Typically, the 30-liter range of packs is right for these outings. For guides who might carry extra gear and spring overnight trips, we build the Serac 45. 
Mountain Pro 20 is a durable, trim and stable pack for riding the lifts. Clean lines and the DNA of EXPED's original pack design. 
Glissade 25 is a feature-rich lift-assist and side-country pack with a place for everything. Goggle pocket, avalanche gear pocket and versatile ski and snowboard carry options. Removable padded hip belt when light loads are carried. 
Glissade 35 has the volume for all-day backcountry tours and multiple compartments for organizing gear. Easy access to everything and a stable ride. Padded hip belt for weight transfer to the hips and sacrum. 
Serac 25 is a lightweight, weatherproof and minimalist pack for compact loads. The Swiss term, Ohne Schnickschnack (no frills) applies! Side access through the water-resistant zipper. Outer pocket for shovel blade.
Serac 35 and 45 are also minimalist packs with one large, top-loading main compartment and a zipper side entrance. Weatherproof roll-top closure and a low-profile hip strap.