At AthenaWink's Etsy shop, friends Carolann Voltarel (known online as Athena) and Carrie Wink sell these awesome Adventure Time drinking flasks.
Voltarel and Wink chose to design their Adventure Time flasks in the look of the popular character BMO and the heroes book The Enchiridion. Both the BMO flask and the Enchiridion flask are made using a stainless steel flask and high quality vinyl wrap. While it may seem bizarre to some that two people would make a flask based around a popular children's show, it should be noted that Adventure Time has a large adult fanbase most of who I'm sure don't mind the occasional drink now and again.
These geeky flasks exude a passion and love that can only be had by fans of the show. Just make sure no kids accidentally spot your Adventure Time drinking flask.