This cardboard box (from a mattress delivery) is 17" by 17" by just short of 5 feet. It would be longer if you extend the flaps on both ends and tape them.

I can recycle this but know it's a fun thing for toddlers and young children to crawl through as a tunnel. If you taped the end flaps to the insides (so it's not super long, and it's more sturdy) you could also set it down over a standing child to give them the sensation of looking up out of a deep hole.

Located behind SaveMart shopping center near Brunswick. If you can't get it before the rains start, I can hold it for you until it stops raining.

Cardboard tunnel fun for young kids (Brunswick/Glenwood Basin)