On rugged runs the Osprey Duro 6 disappeared on the back, fading into the background so we never noticed it. Many pockets were placed and sized well and it has the best included hydration setup. Our only complaint is the small retention straps on the back, which need constant attention. Get them out of the way of the main pocket and we wouldn’t have a complaint. This is a great pack for just about any running hydration purpose.
The Duro 6 disappeared on my back thanks to two straps across the chest and wide shoulder straps. Yet another adjustable strap cinches the pack snug. The chest straps have a bit of stretch and hook in place easily, slipping onto a rail system running down each shoulder strap. The open jaw clips right on and, with a quick pull, pops right off. A divider in the bladder sleeve keeps sloshing to a minimum.
The Duro 6 comes with its own bladder, the 1.5 liter Osprey Hydraulics LT. A handy clip system separates the bladder from the hose for refilling without having to reroute the hose afterwards. A divider in the bladder limits sloshing. The pack doesn’t come with flasks, but pockets on each shoulder strap are ready to accommodate them. The Duro 6 can carry a 1.5 liter bladder and two 500 ml flasks up front for a total of 2.5 liters, or roughly 85 ounces.
The Duro has a more traditional, backpack design; with a zipper access hydration sleeve, a main pocket, and a valuables pocket. There’s a kangaroo pouch out the back and an easy spot to stash a layer on the fly. A couple of sleeves and pockets ride on the shoulder straps. Our main issue with the Duro 6 came from the kangaroo pocket. It worked great, but is suspended by two clips that snap to the top of the pack. To access the three zip pockets means undoing these zippers, which is an annoyance.
Because it looks and feels a lot like a backpack the Osprey Duro 6 was comfortable and easy to use for mountain biking and hiking. There’s enough room for marathon rides in the summer and half day hikes.
Within a mile of starting a run I forgot this pack was on. With mesh everywhere the pack comes in contact with the skin, it felt good and kept me from getting too sweaty even when it was really hot. When the pack was full and I added a full bladder it tended to fit like a ball was inside, but the load tended to eventually settle and feel good.
Ryan Stuart is freelance writer and jack of all sports—trail running, mountain biking, whitewater paddling, surfing, climbing, skiing and mountaineering—based on Vancouver Island. Follow his testing on Google+.