What to Look For in a double car seat stroller travel buggy; just click for source,

A side-by-side double with an incredibly compact footprint (for narrow doorways and public transport). Add seats or a carrycot (with adaptors) to increase the size of the frame for kids up to 50lbs per seat.

Budget double with suspension for the front and back for uneven surfaces. Large storage basket, padded handlebars, and large storage basket.

Size

In general double pushchairs are generally wider than single models - especially when they're side-by-side buggies, like the Kolcraft Geo 3 and UPPAbaby Vista 2. The good thing is that this extra width allows them to accommodate heavier children without straining the chassis. They also have other important features that help them stand out, like generously-sized pop-out canopies with SPF 50 and windows that peek out; swivel lock front wheels which help navigate narrow spots such as shopping aisles; cup holders for one parent and the clever fold mechanism that can be done by one hand; and 10 inch back wheels that aren't designed for tough terrain but handle city streets and theme parks quite well.

In terms of cost these kinds of lightweight buggies, which are side-by-side, are surprisingly affordable.

Weight

The lighter the double buggy the more easy it is to move and lift. The Joie Evalite Duo, which is the lightest of our lab tests, is an excellent option if weight is an issue. It still has plenty of features like the large pop-out canopy, SPF50 and peekaboo window, a quick-release folding system that can be stowed flat in just a few seconds with four-wheel suspension to handle rough terrain and a swivel wheels on the front, which makes it easy to maneuver narrow aisles in supermarkets and shops. It's priced at just over $1000, it's also a super-affordable stroller. It can also carry twins or a baby and toddler with the purchase of an additional'sidepack'.

Flexibility

A good double buggy will provide a great deal of flexibility, regardless if you have twins or an infant and a toddler. Buggies with narrow tandems are ideal for navigating tight spaces, while side-byside models ensure that your children are properly cared for and Double Travel Buggy will help you keep an eye on them while you navigate the supermarket or the park. Many also have a wide variety of seat configurations, so you can adapt them as your children grow, and some even have the option to add a ride-on or car seat.

The Joie Evalite Duo is a fantastic example. It can accommodate two seats or a car seat, and its easy-to-use adaptors allow you to change from a single seat to a double stroller with bassinet in just a few seconds. It also has a nice-sized pop-out UPF 50+ sunshade canopy and adjustable leg rests, as well as peekaboo windows on both seats as well as the standing fold is simple and easy to perform with just one hand; and a premium suspension that makes light work of rough terrain.

Tri-fold buggies, such as the iCandy Peach are another versatile option. They are perfect for narrow doors and aisles. They are also able to accommodate twins and a large kid by adding UPPAbaby's ‘PiggyBack’ board (which is sold separately). They provide a spacious basket and include all the extras you might need, including rain covers and liners.

Tandem buggies are typically designed with your children sitting close to each other. This makes them more stable and easier to push on uneven surfaces, however they can be difficult to maneuver around and over kerbs. They typically have a larger footprint than a single-seater pushchair and may be a bit too long for getting through doorways.

Comfort

This is among the most comfortable, lightweight doubles we've tested. It has stadium-style seating on both seats, which means your children can take in the view. It also comes with a large UPF 50+ canopy that has a the peek-a-boo window, and a padded toddler seat with an RumbleSeat with built-in adjustable foot and leg rests as well as an integrated cup holder for one parent. The seats can recline independently by pressing a lever under each seat. Testers also love how the straps can be secured and removed with just one hand. The handle is simple to turn making it easy to fold. It also stores with the backrest raised for easy access.

With 30 different configurations (it'll carry twins as well as a toddler and baby or three kids if you add the option of a "PiggyBack" board) this is a fantastic choice for families who are looking to expand with their child. The large basket and soft suspension make it ideal for kerbs, as well as for use in cities. It is also very reasonably priced. BabyGearLab recommends it to children from 6 to 12 years old.