The red pack works just as well and is made of all recycled material !!
Backpacks can be purchased online. REI also sells stuff for dogs.
When putting the pack on, make sure it fits over the shoulders and not on the back. Adjust it to fit snug so it won't move around.
Get your dog used to the pack first before loading it. Then start with light bulky items and work up to heavier weights.
It is important to gradually work them up to higher weights. Their muscles need time to build up to prevent injury.