While garment weight is always a key factor on technical backpacking and mountaineering trips some ultralight minimalist jackets lose functionality in the quest for shedding excess ounces. This certainly isn't the case for the Outdoor Research Celestial Jacket. While it weighs a smidgen over ten ounces (in large size) the Outdoor Research Celestial Jacket packs plenty of extras in stereo like a dual-pull adjustable hood dual slash napoleon pockets and double-separating dual TorsoFlo™ vent zippers beneath the sleeves. All of the lightweight and highly breathable Gore-Tex® PacLite® fabric is full-seam taped and features water-resistant zippers. If you're counting ounces and features the Outdoor Research Celestial Jacket is the right balance--but if you're playing rough around abrasive surfaces consider a backcountry jacket with weightier reinforcement materials.