40 oz Wide Mouth with Flex Straw Cap
The 40 oz Wide Mouth is Hydro Flask's classic bottle in its biggest everyday size, great for long workdays, gym sessions, or anyone trying to drink more water. The Flex Straw Cap lets you sip one-handed, closes to be leakproof, and has a flexible handle for carrying.
TempShield double-wall insulation keeps drinks cold for 24 hours. The wide mouth makes it easy to add ice and clean. The stainless steel won't hold on to flavors, and it's dishwasher safe. GearJunkie named it Best Overall in 2025.
40 oz capacity
Cold 24 hours
Flex Straw Cap with flexible carry handle; leakproof when closed
Wide mouth for ice and easy cleaning
Stainless steel; no flavor transfer
Dishwasher safe
Lifetime warranty
"I didn’t know that this would be very, very helpful for me, especially when it comes to staying hydrated while working at the piano. I’m also glad that it holds onto icy water for a good long period of time. I’m a huge fan of Hydro flask. I’m sure I’ll buy more in the future."
Hydro Flask
Hydro Flask makes insulated stainless steel bottles and containers that keep drinks cold or hot for hours, perfect for staying hydrated on the go.
