Check the listing for details. Ankle Monitor Flask (5 Oz) - Hidden Alcohol Flask - Funny Liquor Gift for House. Color: Black, Condition: Open box. Listed at 20.00 USD. The Ankle Monitor Flask is a unique and fun gift for house parties or gatherings. This 5 oz hidden flask is shaped like a square and painted in black, making it a stylish accessory to conceal your favorite liquor. Made of lightweight plastic, this flask is easy to fill and drink from discreetly. The product dimensions are 2.5"D x 3.5"W x 3.25"H, and it weighs 4.8 ounces, making it convenient to carry around. Perfect for those who enjoy a good drink and want to have a little fun while doing so. BRAND NEW NEVER USED. I OPENED BECAUSE I GOT IT FOR BIRTHDAY. ITS REALLY COOL, BUT I HAVE JUST HAD ON A SHELF AND I DOUBT I WILL EVER USE.The Ankle Monitor Flask is a unique and fun gift for house parties or gatherings. This 5 oz hidden flask is shaped like a square and painted in black, making it a stylish accessory to conceal your favorite liquor. Made of lightweight plastic, this flask is easy to fill and drink from discreetly. The product dimensions are 2.5"D x 3.5"W x 3.25"H, and it weighs 4.8 ounces, making it convenient to carry around. Perfect for those who enjoy a good drink and want to have a little fun while doing so. BRAND NEW NEVER USED. I OPENED BECAUSE I GOT IT FOR BIRTHDAY. ITS REALLY COOL, BUT I HAVE JUST HAD ON A SHELF AND I DOUBT I WILL EVER USE.