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Australian company QuickSmart has designed a collapsible stroller that fits into a backpack. The whole package weighs less than 9lbs, and is suitable for a child aged from six-months (up to 33lbs/15kg). And features include a 5-point harness and canopy, padded seat and footrest, a built-in shopping basket.
Available from Amazon UK for ~$160 to $194. (£99.99 to £119.99)