Pet Dog Carrier Backpack Australia

My puppy is a staffordshire terrier and weighs 10Kg. She fits in OK and doesn't mind me walking with it. I am not sure how she will go when I ride a bike. The Carrier backpack probably won't be big enough when she reaches full weight (about 15.5 Kg) in a few months as she is already restricted within the backpack. The design needs to be modified to include a rigid flat base for the dog to sit on. The current base is too flexible for the dogs comfort. A metal backpack frame would be better for my comfort too.