The Check in was designed thinking on the user. From the size that allows you to maximize packing but keeping the weight in limit with airline regulations. A zipper less design and engineered in an unbreakable poly-carbonate shell with an aluminum frame and corners to protect against travel wounds. It's perfect for a 1 to 3 week trip. It has an anti microbial interior lining and 60 mm wide whisper quiet wheels that allow you to glide through the airport