Nalgene It
A loud, colorful bottle that American students bring to foreign countries to yell at other Americans and pretend they're not lost.
"I saw a Nalgene in Paris and screamed, 'AMERICA!'", @lostinparis
"My Nalgene is the only thing I recognize in Tokyo.", @tokyolife
"I use my Nalgene to flag down other Americans at the airport.", @americanabroad