HydroFlask Questions Answered

Whether you’re a seasoned Hydro Flask fan or thinking about picking up your first bottle, there are loads of questions people ask about these brilliantly designed flasks.

From whether they’re dishwasher safe to how long they actually keep drinks hot or cold, we’ve pulled together the answers to the most common Hydro Flask questions right here.

If you're wondering where to buy one, how to clean it, or what makes Hydro Flask so popular, you’ll find everything you need to know below. Stay hydrated — hot or cold — in style!

✅ Dishwasher & Cleaning

• Are Hydro Flask bottles dishwasher safe?
  Yes — newer models (from 2020 onwards) are safe to put in the dishwasher. Older versions are hand-wash only, so check the base of your bottle or the Hydro Flask website.

• Can Hydro Flask go in the dishwasher?
  Yes — if it’s one of the newer, dishwasher-safe models.

• Are Hydro Flask lids dishwasher safe?
  Yes — lids, straws, and silicone boots are top-rack dishwasher safe.

• Are Hydro Flask straws dishwasher safe?
  Yes — top rack is fine, but using a straw cleaning brush helps keep them spotless.

• How do you clean a Hydro Flask?
  Wash with warm, soapy water or pop it in the dishwasher (if it’s a newer model). For a deeper clean, use bicarbonate of soda and vinegar.

• How do you clean the lid?
  Take apart the lid and straw (if it has one) and clean with warm, soapy water or put them on the top rack of the dishwasher.

• How often should you clean it?
  Daily if you’re using it for anything besides water. For water only, give it a proper wash every couple of days and a deeper clean weekly.

• Can Hydro Flask get mouldy?
  Yes — especially in the lid and straw if it’s not cleaned regularly.

Shop the full Hydroflask UK collection here

✅ Use & Performance

• Can Hydro Flask hold hot water?
  Yes — it’s designed to safely hold both hot and cold drinks.

• Can Hydro Flask be used for hot drinks?
  Definitely — it’s great for coffee, tea, or soup on the go.

• Can Hydro Flask hold boiling water?
  Yes — though it’s recommended to let boiling water cool slightly before sealing it to avoid pressure build-up.

• Can Hydro Flask hold fizzy drinks?
  Yes — but open with care, as pressure can build inside.

• How long does it keep drinks cold?
  Up to 24 hours cold, and around 12 hours hot depending on size and lid type.

• Can Hydro Flask go in the microwave?
  No — it’s stainless steel, so never microwave it.

• Can Hydro Flask go in the freezer?
  No — it could damage the insulation.

• Can Hydro Flask rust?
  It’s made from high-quality stainless steel, so it’s very unlikely — but always dry it properly.

Shop our Hydro Flask water bottle collection here

✅ Safety & Materials

• Are Hydro Flask bottles lead free?
  Yes — current Hydro Flask products are completely lead-free.

• Are Hydro Flask BPA free?
  Yes — the bottles and lids are all BPA-free.

• Are Hydro Flask non-toxic?
  Yes — made from food-grade stainless steel and safe, non-toxic materials.

• Are Hydro Flask leakproof?
  Yes — especially when using their Flex Cap or Wide Mouth lids properly.

• Are Hydro Flask bottles safe?
  Absolutely — made with pro-grade stainless steel and BPA-free lids.

• Are Hydro Flask tumblers dishwasher safe?
  Yes — if you’ve got one of the newer versions.

• Are Hydro Flask boots dishwasher safe?
  Yes — top rack is best.

• Are Hydro Flask bottles stainless steel?
  Yes — they use 18/8 professional-grade stainless steel.

✅ Sales, Availability & Brand Info

• When do Hydro Flask have sales?
  Typically during seasonal clearances, Black Friday, Boxing Day, and January sales. Retailers like John Lewis, Ellis Brigham, and Cotswold Outdoor also offer discounts.

• Who stocks Hydro Flask in the UK?
  John Lewis, Cotswold Outdoor, Ellis Brigham, Snow+Rock, Amazon UK, and of course, US at Balsa Surf!

• When are new Hydro Flask colours released?
  Usually seasonally — spring and autumn. Keep an eye on their official website or UK retailers for announcements.

• When does Hydro Flask restock?
  Frequently online and with seasonal updates in stores.

• Where does Hydro Flask ship from?
  For UK orders, it typically ships from local distribution centres or European warehouses.

• Who delivers Hydro Flask orders in the UK?
  Usually Royal Mail, DPD, or Hermes depending on the retailer.

✅ Product History & Company Info

• Where was Hydro Flask founded?
  Bend, Oregon, USA.

• Where are Hydro Flask products made?
  Designed in the USA, manufactured in China.

• When was Hydro Flask founded?
  2009.

• When did Hydro Flask become popular?
  It took off globally around 2016-2017 — and became a social media favourite by 2019.

• When did Hydro Flask change their logo?
  In 2015.

• Who founded Hydro Flask?
  Travis Rosbach and Cindy Morse - read more about it here >

✅ Comparisons

• Which is better: Hydro Flask or YETI?
  Both are premium brands — Hydro Flask is lighter and has a wider range of colours, while YETI is known for rugged, tough gear. In the UK, Hydro Flask is often easier to get hold of.

• Which is better: Hydro Flask or Stanley?
  Stanley is perfect for camping and outdoor adventures; Hydro Flask is more everyday-friendly, lightweight, and stylish.

• Which is better: Hydro Flask or ThermoFlask?
  Hydro Flask is higher quality and better insulated, but ThermoFlask is more affordable.

• Which is better: Hydro Flask or AquaFlask?
  Hydro Flask wins for insulation and quality, while AquaFlask is a budget-friendly option.

• Which is more expensive: Hydro Flask or AquaFlask?
  Hydro Flask is typically the pricier brand.

✅ Miscellaneous

• Will Hydro Flask replace a dented bottle?
  No — dents from drops aren’t covered.

• Will Hydro Flask replace a broken lid?
  Yes — if it breaks under normal use, it’s covered by their warranty.

• Which Hydro Flask is the best?
  The 32 oz Wide Mouth with a Flex Cap is very popular. The 21 oz Standard Mouth fits well in most UK car cup holders.

• What makes Hydro Flask special?
  Superior insulation, durable build, eco-conscious, and loads of colour choices.

• Why are Hydro Flasks so expensive?
  High-quality stainless steel, durable design, excellent insulation, and brand reputation.

• Why do Hydro Flasks dent easily?
  The double-walled design can dent if dropped — though it usually still works fine.

• What does Hydro Flask mean?
  A combination of “hydro” (water) and “flask” (container).

• What is Hydro Flask made of?
  18/8 pro-grade stainless steel, BPA-free plastic, and silicone.

• What is the Hydro Flask logo?
  A happy, minimalist person with raised arms, symbolising hydration and adventure.