This item is fulfilled by Printful.
I drew the doodles.
I also bought one to see it in person, and can tell you the following:

The fine lines of the print were better quality than I expected
The glass is pretty thin, and I handle it with extra care
Hand-wash only, which is fine because I don't have a dishwasher
Can't be microwaved, which is fine because I don't have a microwave

• Glass material
• Volume: 16 oz. (473 ml)
• Not dishwasher or microwave safe
• Blank product sourced from China