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The perfect-sized Hydro Flask Refill for Good Limited Edition 21oz Standard Mouth Water Bottle is exactly what you've been looking for. Plus, with the purchase of this Limited Edition #RefillForGood bottle, Hydro Flask is contributing real dollars to the Surfrider Foundation.
18/8 Pro Grade Stainless Steel – Won't retain or transfer flavor.
Mouth Diameter – 1.91"
Diameter – 2.85"
Height – 11.1"
TempShield™ Insulation
BPA-Free and Phthalate-Free
Dishwasher Safe