Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Cocoon with Spider

Cocoon with Spider
Tamarac National Wildlife Refuge, Becker County, Minnesota, USA
June 1, 2017
This cocoon was on the outside of a pit toilet on the refuge. Also notice the spider partially hidden on the right side of the cocoon.

I believe this is very likely
I believe this is very likely a Malacosoma disstria cocoon.

Thanks Jim. It might be unlikely to get much beyond "very likely."