The CiloGear 30L WorkSack has been refined over time until… perfection? The pack's capacity is best for day trips and car-to-car alpine climbing, but can also work for 1-3 night climbs if you're traveling ultralight. Due to its durability (across all 4 fabric options) the pack also performs very well for rock climbs of all types. This is the most comfortable pack (for technical climbing) we've ever tested. If you're looking for a do-everything small capacity alpine pack, look no further.
If you want one all-purpose pack that's also large enough for multi-day winter climbs consider the CiloGear 30:30.
If we were to choose two packs for climbing primarily in North America we'd get the Cilo 30L WorkSack and a Hyperlite Mountain Gear 3400 Ice Pack, the latter of which is more comfortable for hiking and lighter than the CiloGear 45L WorkSack.
Check out the complete Mountaineering and Alpine Climbing Backpack Review to see how the 30L WorkSack compares to the competition.