Jon Miller wrote a review of Osprey Packs Poco Plus Kid Carrier - 1404cu in on June 8, 2014
Familiarity: I've put it through the wringer
I've found that the Poco Plus stands out above some of the lower-priced offerings from Osprey, mainly because of the ample storage space and built-in sun shade. Those two features alone make this pack worth your while if you're venturing out for more than just a stroll around the corner with your little one.
So far this summer I've had my 18-month-old son out a half dozen times in the Poco Plus. He weighs in at around 30 pounds, so not only is the Poco beefy enough to make his ride comfortable (and mine as comfortable as you can make it), but it has enough space to bring all the stuff you need when taking your boy miles into the backcountry. And the sun shade is a really great feature to keep him a bit more protected from whatever it is you run into (sun, bugs, low-hanging branches, etc).
Hard to find a better workout than carrying your kid on your back up and down mountains!