Hydroflask thermal coffee flask with leakproof sip - dew colour
Hydro Flask Leakproof Flask with Flex Sip Lid (473ml)
Hydro Flask Leakproof Flask with Flex Sip Lid (473ml)
Hydro Flask Leakproof Flask with Flex Sip Lid (473ml)
Leakproof flask with sip lid by Hydroflask Pacific blue
Hydroflask thermal coffee flask with leakproof sip - goji colour
Hydro Flask Leakproof Flask with Flex Sip Lid (473ml)
Hydro Flask Leakproof Flask with Flex Sip Lid (473ml)

Hydro Flask Leakproof Flask with Flex Sip Lid (473ml)

Regular price£29.00
  • FREE UK delivery on orders over £30
  • FREE returns
  • Plastic free packaging

Our selection of Hydro Flask sip lid leakproof flasks are ideal for use after a cooling dip in the water. TempShield® Double Wall Vacuum Insulation ensures your coffee, tea, or warm beverage stays at the desired temperature for hours, so you can enjoy it when you get out. Its leakproof Flex Sip™ lid makes on/off sipping easy, even with cold hands - just twist to sip, twist back to lock. Expertly crafted with outstanding quality, Hydro Flask coffee flasks are covered by a lifetime warranty, giving you extra peace of mind.

- Flex Sip™ lid (twists to open and close)
- Fits under most coffee brewing systems
- TempShield® Double Wall Vacuum Insulation
- Fits most backpacks and car cupholders
- 18/8 Pro-Grade Stainless Steel
- BPA-Free
- Phthalate-free
- Color Last™ Powder Coat
- Lifetime Warranty
- Made in China following Hydro Flask Standards of Manufacturing Practices to promote ethical business practices

Hydro Flask are based in Oregon USA. Hydro Flask created a charitable programme Parks For All, to benefit public green spaces and promote happier, healthier lives outdoors for all. To date, they have supported more than 122 non-profits and donated over £1.3 million and counting!

Postage is FREE for orders £30 and over.

Orders under £30 cost £3.95.

Our standard UK delivery service uses Royal Mail Tracked 48 (2-3 working days).

In a hurry? Place an order by 1pm for Next Day* Special Delivery with the Royal Mail for £6.95.

*some post code exclusions apply

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Customer Reviews

Based on 3 reviews
Pauline E.

Look great

Carrie F.
Outstanding heat retention!

I bloody love this flask.

Firstly, it doesnt leak - you can throw it around, turn it upside down. It's got a great seal.

Secondly, it has a great lid with two simple steps to take apart and clean. This seems a robust and hard wearing mechanism, that's simple.
(I bought another brand prior, and took it apart, leaked ever since - this does not!)

Thirdly, last night at just before 10pm i made a cup of tea in it as I am staying away from home.
Fell asleep before I'd even made a start on it and at 8.15am this morning it was still hot!

And finally, it feels nice to hold, slight texture on the sleeve makes it easy to hold and not slippery (I drop things a lot!)

Absolutely worth the price!!

Also I would like to mention how great Sea and Stream are with delivery and returns as I have used them for several items.

Brilliant flask

I absolutely love this mug. Mostly as it is genuinely leakproof; I can chuck it in my pannier for bike/swims and not a drop escapes. It replaced one that claimed the same protection and lied! Alternatively, if I’m walking I can use a clip with the handle to keep it handy on the outside of a rucksack.
It’s mildly depressing (and shows my age?!) that I also like the fact it easily comes completely apart for cleaning (so hot chocolate is an option 🙂). It feels really robust, is the perfect size and a great colour (a welcome bright spot on some grey days), it should be the last one ever need.
Not the best pic I’m afraid, cold hands!

Kind words from our customers


What I really wanted to say was how impressed I am that the whole package is plastic free, really great to see and wish more would follow your lead.


Excellent! Many thanks Lou. Excellent customer service on your part👍. Will definitely be recommending Sea & Stream to my friends and family 👍😊


I couldn’t love my new swimming costume more!!! Such an incentive to take the plunge ! And such cute packing 💕

I’ll be back!

1% for the Planet

We are members of 1% for the Planet and give back 1% of every purchase that you make to environmental organisations.

A bit about us

It started with a swim.

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