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Top 5 Double Buggy Sale Deals With a clever frame that can be expanded widthwise and can take 2 seats or carrycots, the multi-award winning Duet is the tiniest side-by-side buggy available. It's ideal for parents who are worried about fitting two doubles in narrow doors or on public transport. The majority of models begin as a single pushchair before adding a second seat or carrycot if required, with adapters to fit car seats (although not all do this). They fold up pretty compactly, making them easy to move an