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![The Mockingbird [TEST] Eko Copy - Single-to-Double Stroller 3.0 (Copy) features a black frame with brown handlebar, canopy, and storage basket, shown on a white surface against a plain white background.](http://hellomockingbird.com/cdn/shop/files/s2d_black_charcoal_penny_single_mode.png?v=1771935446&width=1600)
Updated for 2026, the 3.0 model of our award-winning Single-to-Double Stroller is designed to grow with your child, and expands to a double if your family grows.
Updated for 2026, the 3.0 model of our award-winning full size Stroller is designed to grow with your child from infancy through early childhood.
What's the difference?
Our best-selling Single-to-Double Stroller starts as a single and can be converted to a double (with the 2nd Seat Kit) if your family grows. It's our most flexible stroller, with everything you'd expect in a premium single stroller—and the ability to grow with your family.
The Single Stroller is a great choice for families with only one child or a larger age gap. It's a bit lighter with a slightly smaller frame, and is available at a lower price point.