Pizza bags again

Over the last year I have been slowly replacing all of our bags buying new ones from bagsolutions based upon recommendations in this forum. Overall we are happy with them but I was wondering if anybody makes a bag you can toss in the laundry. If a bag goes out on 10-15 deliveries every day eventually it will start getting a little shoddy. We used to launder our ski parkas in the winter back home, and a pizza bag basically performs the same functions, a durable exterior with insulation layer to keep the inside contents much warmer than the outside air. So, does anybody know of a pizza bag that can be tossed in the washer on gently cycle without destroying the insulation?