Is there a backpack or way to hold a big box?

I'm trying to find another backpack other than the chrome industries warsaw backpack to hold a big box while riding my bike.

Like this: https://imgur.com/a/2RtRL0r

Does anyone know how to do it on a preexisting backpack or know another brand of backpack that does this? Chrome industries is a bit too expensive for me and I need to figure out how to move a big a box while riding my bike.

I didn't know which reddit thread could help me with this so hopping bikepackers could help XD.