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Amazon [amazon.com] has 6.7-Oz Hydro Flask Micro Water Bottle (Black Arc) for $12.97. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]6.7 OZ BLACK ARC MICRO HYDRO: Fresh from Hydro Flask Japan, the Micro Hydro water bottle delivers 6.7 oz of hot and cold in a mini Hydro Flask. Pop it in your pocket, clip it on a bag, fit in a lunch box, the tiny size sits easily in the palm of your hand.