Pictured above are two cans of Dr Pepper. The one on the left comes from some beverage reseller's website, here, while the one on the right comes from a reddit thread, here. The products are identical, at least on the inside of the can; both cans contain 12 fluid ounces (355 mL) of Dr Pepper. But the outside? Definitely not. The one on right has ridges as you approach the top of the can; the one on the left is smooth. If you were around in the late 1980s, maybe this isn’t all that interesting to you; the ridged can, you’d assume, is just old -- for a few years during that decade, most soda cans in the United States looked like that. But that’s not actually what’s going on here, as evidenced by the fact that Dr Pepper has gone through a few brand refreshes since the 1980s. Nope, the can on the right is something you can purchase today.

You just need to take a flight to Hawaii first.

Oh, and it’s not just Dr Pepper. Almost all soda cans (and beer cans, for that matter) in the state use this ridged can design, as seen below (via here). And it has nothing to do with volcanos, luaus, leis, or anything else stereotypically Hawaiian. The issue? transportation.