where is the Apple Logo Backpack?

Over the many years of its existence, Apple has produced a lot of swag. Generally, this is merchandise that is gifted to various people for various reasons. When I worked for a cellular phone company, we frequently got things with logos on them from companies like Apple, Motorola, LG, and Nokia. But, for the most part, Apple is not in the business of selling apparel and accessories.

I believe the headquarters in Cupertino has a gift shop where you can buy many things with logos on them. To the best of my knowledge, they don't do internet sales, though.

FWIW, I would never use a backpack displaying a computer brand logo. The reason being, it would be an attractive item to thieves indicating the backpack contained an expensive computer.

You are not asking Apple here. We are end users like you.