We have had one of the several of the Macpac carriers, and have found the Macpac possums (older model) to be the best fitting / most comfort even when carrying older children. Although it also needs to be well adjusted with the straps to sit right once they're on your back. Having had heavier little ones it has helped. Even the odd double up (one on shoulders as well) hasn't been too bad for shorter distances. I have heard some good things about the osprey poco though - but not personally tried it.
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