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From Shiapedia
2in1 pushchair Travel System
A 2in1 travel system allows you to easily transfer your child from their car seat to their stroller without waking them. These are often more expensive than pushchairs, but offer greater convenience and flexibility.
Pick a model that matches your lifestyle and travel needs. For instance, you could consider a car seat and stroller combination that will grow with your child or that comes with a large basket to fit everything from nappies to day's groceries.
Convenience
A 2 in 1 bassinet stroller-in-1 travel system is the best option for parents who want to take their child on regular excursions without disturbing them. The travel system is comprised of a pushchair and car seat that attach to the same frame so it's easy to transfer your child from the car to the pram without disrupting them. This type of travel system is available in a variety of combinations and it's crucial to find one that meets your needs. Look for a pushchair with a wide range of features including a large basket and the capability for the stroller rocker 2 in 1 to fold easily for storage. You can find models that allow you to install the car seat either forward-facing or reverse-facing. This is a great option for infants who aren't quite ready to start walking yet.
Flexibility
A baby travel system can be lifesaver. The process of leaving the house with children can be a challenge enough. Baby wipes, nappies and bottles take up more space than you thought. If you add a car seat to the mix it becomes even more of a challenge. You have to remember the nappies, keys, wallet and phone, not to mention the baby sleeping that you do not want to disrupt. A 2in1 travel system offers you a pushchair as well as a car seat that attach to the same frame, so you don't need to wake your child to put them in the car. The versatility of this kind of pram really does make parents' lives easier.
Certain travel systems are compatible with a carrycot (not included) and a seat unit. It is important to consider this flexibility when choosing your stroller.