Does anyone know a collapsible dog crate that can be easily carried in my backpack? I'm taking Greyhound and I won't have a car to leave a bigger crate in but I need something I can let him hang out in while I'm gone. (As in if we were in a hotel room, I wouldn't leave him just outside in a crate alone.) I would let him be loose but he has separation anxiety and a crate creates a "safe" place and all of that.

All of the ones I've looked at online look heavy.