Padded packaging from Mounjaro (Sharples BL1)

My dog pees in his bed (ownership thing) at least twice per day and in summer I can use washable blankets. In winter, it gets harder to dry them in time and they aren't as warm.
I've tried foam beds, he shreds them.
My friends gave me the packaging from a Mounjaro box and I've put that it a pillow case and it's been perfect so I'm going to round up as many as possible and use them.
So far, I can only get 2 per month so am looking to get more if them.
I'm discreet and can collect from the front door or porch etc.
Thank you