Hydro Flask Standard Mouth Black 21 oz is a versatile hydration solution, slightly taller than the 16 oz version, providing extra capacity while maintaining a grip-friendly diameter.
TempShield® Insulation: Double-wall vacuum insulation keeps beverages cold for up to 24 hours and hot for up to 12 hours.
18/8 Pro-Grade Stainless Steel: Constructed with high-quality steel for pure taste and long-lasting durability.
Wide Mouth Opening: Compatible with most backcountry water filters and allows for easy adding of ice cubes.
Updated Design: Features a refined collar and a flexible handle on the cap for easier carrying.
Honeycomb™ Insulated Cap: Provides additional temperature control within the lid itself.