How large should a box be for a puppy up to 8 weeks old

The sticky, https://www.askmehelpdesk.com/dogs/information-articles-our-dogs-expert-labman-53153.html#post251802
Starts with using a crate and size guidelines. Here is a picture of one of my puppies in her crate.

http://www.photolocker.net/images/Labman/hollyhighanddry.jpg