Several features set the top-of-the-line Poco apart from its rivals: One, no question the “Fit on the Fly” hip belt adjuster was the easiest and fastest to cinch down and size to my waist. At its smallest setting, it fit me snugly, with no extra room for rubbing. Two, it has the most ample, sun-and-rain cover. Pre-attached, it unzips from its sleeve and pulls forward to attach via clips to the side of the shoulder straps. Three, the zip-off daypack compartment is ideal for shorter outings when you need less gear. No need to haul the extra weight; simply unzip and go. There’s still a cavernous lower compartment for diapers (changing pad included), snacks, and a change of clothes. Better yet, when your child wants to walk, the low-profile daypack can become your child’s “practice” pack. When they get tired, just zip it back on. Four, stirrups. Yup, this ride sports a pair of nylon stirrups that keeps tired little legs from dangling (and, as we discovered on a hike up New Mexico’s 12,200-foot Deception Peak, lets them play “horse”). Other niceties: A hidden hydration slot holds a bladder, and the child’s harness was the easiest of the batch to attach; ample padding keeps the strap from disappearing into the cockpit, so no more rooting around for tangled shoulder straps. True to Osprey’s pack-building pedigree, the Poco has no fewer than seven smaller pockets, both mesh and zippered, including a small one sized for a cell phone or pacifier on the chest straps.