we had an older Macpac one, tough as nails, worked very well. When they got too big/heavy for that the pace of our walks really slowed down as they had to walk themselves...but that only lasted a short while before they get strong enough and build up their stamina. My brother had an Osprey one which was a lot lighter than the Macpac and they werew very happy with that one, although I never tried it.
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