I have a Kelty Convertible frame carrier (that converts to a stroller). I loved it, but we did primarily use it for canoe trips, camping, hiking & days at the zoo, when I didn't want to lug an empty stroller, but wanted to have both a carrier & a stroller.
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It's not made any more as far as I can tell, but is available on Amazon still.
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I've preferred my pouch slings & mei tai style carriers for around the house, shopping, etc, but when it's going to be hours & hours of carrying over possibly rough ground, with a 18mth+ child, I'd much rather have my Kelty pack! We often used it as 'just' a stroller for walks & such as well. It was definitely one of our most used baby items, and I'm so glad we didn't sell it last year when DS was totally too big for it, as now we still have it for the new baby!
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I think one of the major benefits of some frame carriers is the ability to remove the carrier with the child still in it -- ours is free standing, and so you load the child first, then put the carrier on like a backpack, it's very simple. And, b/c it's made by the same company that makes our hiking packs, we know that the weight distribution works. I have no problem carrying the 11lbs of pack, an 18mth old, and some camping gear, for a total of over 55lbs, over trails on our canoe trips, and I am pretty small. I'm 5'4" and can adjust the pack small enough to fit me well.