Per their UK website:

The Doggy Rucksack is designed with a thick rest bottom pad and an adjustable cavity size so your pup can fit perfectly. The Doggy Rucksack includes 3 pockets (1 front pocket and 2 side pockets) so you can store all your dog essentials when going on your adventures. For extra safety, there is a safety hook to attach to your pup's collar preventing them from jumping out. And for your personal comfort, the Doggy Rucksack has been designed with 2 thick shoulder straps and a hip belt, that help to minimise any jerky movements.

This new Rucksack is black.  Size is Medium for dogs 9-18 pounds.