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Buying a Tandem Double Buggy A tandem double buggy could be a great choice for twins or children who are very close in age. They're smaller than side-by-side buggies and are ideal for maneuvering tight spaces, such as entrances, on public transportation and on rocky terrain. Some are able to be converted into travel systems that use two carrycots or car seats for children. They can be heavier, longer and less stable than a single pushchair. Convertible If you're looking for convertible single-to-double stroller or want to add another seat to an exis