Hydro Flask 64oz Growler. Happy hour is even happier with the 64 oz Growler. From binge-watching campfires to counting constellations, the Fresh Carry System™ and TempShield™ double wall vacuum insulation keep every sip of your IPA or kombucha as carbonated and icy cold as when it was first poured. Plus, the streamlined handle makes this Growler easy to carry from tailgate to camping chair. Durable 18/8 Pro-Grade Stainless Steel construction. Twist off cap. Mouth diameter: 2.44". Imported.