Is water flask profitable to sell on Amazon United Kingdom?

The niche generates £67K/yr across 71 tracked products. 3 of 12 products launched in the last 360 days are still selling. 90-day search growth is +47.6%. Flapen's verdict: Worth a look (56/100).

How competitive is the water flask niche?

25 brands and 50 sellers compete. The top 5 products take 28% of clicks and top 5 brands hold 62% of demand.

What do buyers complain about in water flask?

Top complaints mined from reviews: Leak-Proof, Size-Overall, Durability. The return rate is 1.1%.

When does demand for water flask peak?

Demand peaks in Jul–Aug–Sep; the busiest month runs 4.3× the quietest.

What does it cost to enter the water flask niche?

Listings span £5.95–£29.33; the average listing price is £12.68 (sweet spot $15–$100). The average incumbent carries 3,906 reviews — the moat a new listing must climb.

water flask

Worth a look

Shows low returns (1.1%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Returns

Great1.1%

return rate — above 5% kills the launch gate

Competition

Great28%

top-5 click share — an open shelf

Brand share

Good62%

top-5 brand share — brands hold most of the demand

Growth

Good+47.6%

90-day search growth — must beat 0% to launch

Price range

Good£5.95–£29.33

cheapest to priciest tracked listing — scored on the share inside $15–$100

Avg price

Good£12.68

avg listing price — sweet spot $15–$100

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Review moat

Okay3,905.68

avg incumbent reviews — the moat a new listing must climb

Conversion

Bad2.0%

search→purchase rate — share of searches ending in a sale

Market size

Bad£67K

£67K/yr · 267K searches

According to Flapen's Amazon United Kingdom niche tracking, water flask is a £67K/yr Amazon United Kingdom market (267K searches/yr). The top 5 brands hold 62% of demand. Demand peaks in Jul–Aug–Sep. Verdict: Worth a look — 56/100.

Data updated Jul 27, 2026 · scored weekly · How we score niches

water flask market data

Units sold / yr: 5K–6K; avg 0–100/product
Revenue / yr: £63K–£76K; units × avg price
Conversion rate: 2.0%
Avg BSR: #176
Page quality: 0%
Prime: 99%
Sponsored: 86%
Out of stock: 9.0%
Avg brand age: 42 months
Avg seller age: 177 days

Competition & brand share

Clicks spread well past the top 5 (28% combined) — an open shelf where new products get seen.

Brands

25 falling

Sellers

Top-5 brand share

62%

Top 20: 97%

Top-5 click share

28%

Top 20: 60%

Open market

33%

Klean Kanteen21%
Otto Koning12%
OLDLEY11%
Mont-Clair11%
Polar Gear7%
Exllena4%

Demand & seasonality

Weekly Amazon search volume, last 60 weeks — +47.6% search growth over the last 90 days.

Peak months: Jul, Aug, Sep · busiest ÷ quietest = 4.3×

Open Trend

Top water flask search terms

klean kanteen49K/yr +18.5%0.7% conv.
1l insulated water bottle21K/yr +211.1%1.1% conv.
metal water bottle 1l27K/yr +30.1%2.1% conv.
750ml stainless steel water bottle18K/yr +24.9%1.3% conv.
1 litre insulated water bottle14K/yr +324.3%1.5% conv.
insulated water bottles 1 litre14K/yr +216.3%1.4% conv.
klean kanteen water bottle16K/yr +16.1%1.3% conv.
water bottle 750ml insulated9K/yr +50.1%1.5% conv.
1 litre metal water bottle10K/yr +70.0%2.0% conv.
stainless steel water bottle 750ml11K/yr +58.9%1.3% conv.

All search terms

Top water flask products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

OLDLEY Stainless Steel Water Bottle with Straw 1L Vaccum Insulated Large Drink Flask Metal Water Bottles 1 Litre Leakproof Keep Drinks Hot Cold for Bike Sports Gym Adult Women Men(Black 1 Lid)

OLDLEY£11.554.4★4,706 rev

Water Bottle Otto Koning 1L - 1 Litre Stainless Steel Vacuum Insulated Flask - Keeps Cold 24h / Hot 12h - Large Leak Proof & BPA Free Metal Drinks Bottle for Gym Hiking & Sports

Otto Koning£8.604.6★10,532 rev

Klean Kanteen£18.254.4★101 rev

Exllena Insulated Water Bottles 1l with Clip Double Wall Vacuum Drinks Bottle Keeps Drinks Cold 24 Hrs/Hot 12 Hrs Stainless Steel Water Bottle BPA Free (Dark Blue)

Exllena£14.384.5★3,351 rev

Klean Kanteen Reflect Deckel Brushed Stainless 800 ml

Klean Kanteen£28.744.5★299 rev

Newest

by launch date

Klean Kanteen£15.36101 rev

4mo ago

Klean Kanteen£18.25101 rev

5mo ago

Fuel24 Duo - Stainless Steel Water Bottle 700ml or 1L - Vacuum Insulated Metal Flask with Straw (Dual use Lid) 1 Litre - for Sports Gym Work Slim Design (Lavender 700 ml)

Fuel24£11.12253 rev

9mo ago

Mont-Clair lO Stainless Steel Water Bottle Vacuum Insulated - BPA Free 12h Hot & 24h Cold Drinks Metal Water Bottle 750ML Leakproof Ideal for Adult Kids Running - Black

Mont-Clair£8.411,139 rev

11mo ago

Mont-Clair lO Stainless Steel Water Bottle Vacuum Insulated - BPA Free 12h Hot & 24h Cold Drinks Metal Water Bottle 1L Leakproof Ideal for Adult Kids Running - Black

Mont-Clair£9.691,139 rev

11mo ago

What buyers say about water flask

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall20%

“Excellent product”

Temperature Retention17%

“Keeps drinks cold”

Value For Money11%

“Excellent value”

Size-Overall8%

“Decent size”

Leak-Proof7%

“does not leak”

Advertised Vs Actual Product6%

“Above expectations”

Strength4%

“The bottle is very sturdy”

Durability3%

“Good durability”

Color3%

“The colour is pretty”

Design-Overall3%

“solid design”

What buyers complain about

Leak-Proof23%

“It started to leak”

Size-Overall7%

“Didnt fit car holder”

Durability7%

“Not durable”

Temperature Retention6%

“it doesnt even last a couple of hours before the temperature drops”

Quality-Overall4%

“Terrible quality control”

Value For Money4%

“Yes it is expensive”

Heating4%

“The bottle heats up”

Strength3%

“Feels quite flimsy”

Ease Of Use2%

“Really difficult to drink from”

Temperature Control2%

“The insulation is very poor - water stays cold for LESS than 1 hour”

Top return reasons

Size-Overall56%

Leak-Proof10%

Weight Heavy7%

Color5%

Quality-Overall3%

Functionality-Overall2%

Ease Of Use1%

Advertised Vs Actual Product1%

Water Resistance1%

Smell1%

Common questions

Is water flask profitable to sell on Amazon United Kingdom?: The niche generates £67K/yr across 71 tracked products. 3 of 12 products launched in the last 360 days are still selling. 90-day search growth is +47.6%. Flapen's verdict: Worth a look (56/100).
How competitive is the water flask niche?: 25 brands and 50 sellers compete. The top 5 products take 28% of clicks and top 5 brands hold 62% of demand.
What do buyers complain about in water flask?: Top complaints mined from reviews: Leak-Proof, Size-Overall, Durability. The return rate is 1.1%.
When does demand for water flask peak?: Demand peaks in Jul–Aug–Sep; the busiest month runs 4.3× the quietest.
What does it cost to enter the water flask niche?: Listings span £5.95–£29.33; the average listing price is £12.68 (sweet spot $15–$100). The average incumbent carries 3,906 reviews — the moat a new listing must climb.