For fun I'll play devil's advocate:
I do a lot of wholesale shipping, a lot of times 100 lots of corns and I usually put 10-25 per bag depending on bag size and whether we are using heat packs or cold packs. We do 10 in 10x20 bags and 25 in 16 x 24's With 3-5 1/2 sheets of crumpled newspaper.
If shipping animals from different litters where lineage is needed, different het status, or morphs that look very similar you need to seperate them.
The standard 16 x 16 x 11 "fish cooler" size easily fits 100-150 corns.
If you are new to shipping and you are going to use cups make sure to put some paper towel or shredded paper in the cups to keep the snakes from smashing up against hard plastic if the box is dropped, thrown, or looks like the carrier played soccer at lunch with it.
I never, ever, mix species in one bag, or combine ophidiophagus species.
Then to save even further on shipping you can get a box banding tool and some plastic straps and you can "marry 2-8 boxes together" into one, especially if the boxes are light or you are shipping delta dash, or one of the other airlines.
Thanks
ben