Hydro Flask 16 oz Coffee with Flex Sip Lid Review

Hydro Flask 16 oz Coffee with Flex Sip Lid Review

The American brand Hydro Flask, established in 2009, has become ubiquitous, offering a comprehensive range of insulated products to cater to various preferences: bottles, thermoses, cups, coolers, and more. Geared towards adventure and nature enthusiasts, Hydro Flask products feature a straightforward design, are BPA/phthalate-free, and boast an appealing color palette.

Having tested the Hydro Flask 16 oz Coffee with Flex Sip™ Lid extensively over three months during hiking and camping, one standout feature for me is its easy cleaning process. The lid conveniently comes apart, allowing for a thorough cleaning of every component. Here’s my opinion after three months of use in the far north.

Hydro Flask 16 oz Coffee Review

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Technical Specs:

  • Brand: Hydro Flask
  • Capacity: 16 Fluid Ounces
  • Diameter: 2.90 Inches
  • Dimensions: 2.9″W x 9.35″H
  • Item Weight: 0.73 Pounds
  • Material: ‎Steel
  • Included Components: ‎Bottle, lid
  • Warranty: Lifetime
  • Best Price: Check On Amazon


  • Good manufacturing quality
  • Ergonomics design
  • Dishwasher safe easy to clean
  • Compact and lightweight
  • Slip-free and colorful


  • The lid design isn’t the best

Traveling mainly alone or in pairs, I wanted to test a special thermos for hot drinks such as tea or coffee. So I opted for the Hydro Flask 16 oz Coffee with Flex Sip™ Lid mug. Whether I’m enjoying a quiet morning at work on my own or sharing a hot drink during a day hike with a companion, the Hydro Flask 16 oz is versatile and accommodating for various scenarios.

Let me clarify that I don’t bring this mug on extended backpacking trips where every gram matters, as 16oz is still a significant weight when you have the option to heat coffee with a stove. However, for day trips when a stove isn’t part of the gear, I appreciate the convenience of heading out with my mug filled with coffee.

Field Test

I extensively tested the Coffee with Flex Sip™ Lid 6oz Hydro Flask mug, primarily in my outdoor workplace where temperatures ranged between 0 and 7 degrees Celsius. Attached to my backpack, this mug became a constant companion, braving all weather conditions and providing the simple joy of a hot coffee with milk during my outdoor activities.

Isothermal Function

The isothermal function of the Hydro Flask Coffee with Flex Sip™ Lid lives up to its promise: it claims the ability to keep drinks cold for 24 hours and hot for 12 hours. In reality, there’s nothing to complain about. When the mug is full or nearly full, even after noon, my drink remains consistently very hot and ready to enjoy, even in cool outside temperatures ranging between 0 and 7 degrees Celsius.

After intensive use over the last 3 months, it has held up well to shocks, the paint is not scratched and above all, it keeps my drinks hot.

Ergonomics and Design

This coffee mug has a cap with a “Flex sip” Hydro Flask system for drinking. We make a quarter turn clockwise on the top of the mug to have an opening of about 1.5cm to drink. It is ergonomic and the small hole opposite the lid makes a call for air to provide a perfect flow, and where you avoid burning yourself.

To close it, just make a quarter turn counterclockwise this time until you have a red sign on the plastic indicating that the cup is properly closed and ready to be transported without leaking.

And on that side, I also tested and approved. I obviously carry it preferably in a standing position when I have a suitable compartment on my bag, but I also sometimes slip it into the main pocket without any fear. Its leakproof lid system ensures a very good seal of the lid, which ensures that there is no leak, even if the mug is lying down or upside down. Its “flex strap” buckle is also very practical, you just need to add a carabiner to it to hang it on the outside of the bag in case of lack of space, for example.

As for colors, there is something for everyone, from sober colors to more funky ones like my neon pink mug. The paint is of good quality, soft to the touch, hasn’t chipped so far, and feels good in the hand. Depending on individual needs, this same mug also comes in 12oz and 20oz.

Note that it is also compatible with the wide-mouth cap with integrated straw from Hydroflask.


A big plus for this coffee mug is and which I greatly appreciated, the lid disassembles into 4 parts very easily, allowing you to wash all the corners. The plastic seal can also be washed, and it is undoubtedly that this part must be treated with the greatest attention in order not to damage it. This would compromise the tightness of the lid, but it is well made. You can put the Hydro Flask 16 oz Coffee with Flex Sip™ Lid mug in the dishwasher without fear of damaging it.


If you’re in search of an insulated mug that can keep your coffee piping hot for hours, whether you’re on outdoor adventures without a bag or simply looking to reduce your environmental impact at work, I wholeheartedly recommend the Hydro Flask 16 oz Coffee with Flex Sip™ Lid. This mug provides a reliable container and offers the convenience of an ergonomic and washable lid. Its attractive design, along with a variety of appealing colors, ensures that it’s not only functional but also uniquely yours, deterring any would-be cup borrowers!

Frequently Asked Questions

Are there any leakage issues with the sip lid?

While I didn’t find any leakage issues, some users have reported problems with the sip lid leaking, even after disassembling and reassembling. It’s recommended to handle the lid with care and ensure proper assembly to minimize the risk of leaks.

How is the lid’s ease of use and functionality?

While some users find the lid fairly easy to open and close, others have mentioned occasional difficulty, especially when trying to remove a stubborn stuck lid.

Any recommendations for dealing with a stuck lid?

If the lid is stubborn, using a towel over the metal fasteners on the side may help leverage the lid off. However, this method can be uncomfortable for hands. Consider taking extra care when attempting to remove a stuck lid to avoid discomfort.

Does the Hydro Flask come in different sizes?

Yes, you can find Hydro Flask mugs in various sizes. The 16 oz size is popular for its versatility.

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