---
title: "Fermentation Jars — £152K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/home-garden/fermentation-jars"
last_updated: "2026-08-01T02:06:46.330Z"
locale: en
meta:
description: "Niche score 58/100 · £152K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 58/100 · £152K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Fermentation Jars — £152K/yr Amazon UK Niche (2026) - Flapen"
---
# **fermentation jars**
**Worth a look**
Shows low returns (0.4%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 32Growth 15Conversion 53Competition 76Returns 98Price range 67Avg price 81Brand share 58Review moat 69Quality gap 75
**Returns**
**Incredible****0.4%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****£17.55**
avg listing price — sweet spot $15–$100
**Competition**
**Great****39%**
top-5 click share — an open shelf
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Good****750.89**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Good****£3.45–£38.07**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****70%**
top-5 brand share — brands hold most of the demand
**Conversion**
**Good****4.3%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Okay****£152K**
£152K/yr · 200K searches
**Growth**
**Bad****-20.6%**
90-day search growth — must beat 0% to launch
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=uk&signal=no_dominant_brand "Top brand's click share < 20%")
According to Flapen's Amazon United Kingdom niche tracking, fermentation jars is a £152K/yr Amazon United Kingdom market (200K searches/yr). The top 5 brands hold 70% of demand. Demand peaks in Jan–Dec. Verdict: Worth a look — 58/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **fermentation jars market data**
- **Units sold / yr**
- **6K–8K**
- avg 100–250/product
- **Revenue / yr**
- **£105K–£140K**
- units × avg price
- **Conversion rate**
- **4.3%**
- **Avg BSR**
- **#187**
- **Page quality**
- **0%**
- **Prime**
- **76%**
- **Sponsored**
- **82%**
- **Out of stock**
- **9.9%**
- **Avg brand age**
- **36 months**
- **Avg seller age**
- **183 days**
## **Competition & brand share**
Clicks spread well past the top 5 (39% combined) — an open shelf where new products get seen.
**Brands**
**24 **▲rising
**Sellers**
**68**
**Top-5 brand share**
**70%**
Top 20: 98%
**Top-5 click share**
**39%**
Top 20: 82%
**Open market**
**25%**
- HEFTMAN19% - volila17% - Kilner17% - SwiftSlot11% - YUEYEE6% - lakeland5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -20.6% search growth over the last 90 days.
6K4KSpike '24Holiday '24Spike '25Holiday '25 seasonSepDecMarJunAugNovMarMay
Peak months: Jan, Dec · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/uk/home-garden/fermentation-jars/trend)
## **Top fermentation jars search terms**
- **fermentation jars**88K/yr-18.3%3.6% conv. - **fermenting jar**20K/yr-19.3%3.3% conv. - **fermentation jar**16K/yr-25.3%2.4% conv. - **kimchi jar**14K/yr-25.9%2.7% conv. - **fermentation kit**13K/yr-6.1%1.5% conv. - **fermenting jars**10K/yr-34.5%2.6% conv. - **sauerkraut fermentation jar**9K/yr-35.8%3.5% conv. - **fermentation jars with weights**6K/yr+10.3%2.9% conv. - **fermenting jars with weights**6K/yr-31.1%3.7% conv. - **kilner fermentation jar**5K/yr-6.0%5.3% conv. [**All search terms **](https://flapen.com/research/uk/home-garden/fermentation-jars/search-terms)
## **Top fermentation jars 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.
0%3%£5K6%£9K9%£14K12%£18K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**Kilner 3 Litre Fermentation Set Airtight Glass Jar with Silicone Lid Air Lock Ceramic Weights & Recipe Booklet Ideal for Sauerkraut Kimchi & Pickles**Kilner**£20.21**4.4★1,833 rev](https://www.amazon.co.uk/dp/B01N7V7PFI) [2**volila Fermentation Jars 1.4 Litre 2 Pack Fermenting Jar with Airlock 1 Way Air Release Vent Ideal for Kimchi Jar Sourdough Jar and Sauerkraut Fermentation Jars**volila**£11.19**4.3★468 rev](https://www.amazon.co.uk/dp/B0CJVGKNY9) [3**volila Fermentation Jars 2.2 Litre 2 Pack Fermenting Jar with Airlock 1 Way Air Release Vent Ideal for Kimchi Jar Sourdough Jar and Sauerkraut Fermentation Jars**volila**£11.91**4.3★468 rev](https://www.amazon.co.uk/dp/B0D2DXNWZT) [4**Fermentation Jars 2 Pack 2L Kimchi Container Fermenting Jar with Airlock Perfect for Fermentation Kimchi Sauerkraut Sourdough Starter Kefir Glass Jars with Lids**YUEYEE**£16.14**4.5★38 rev](https://www.amazon.co.uk/dp/B0FHQ2SXDK) [5**SwiftSlot 1.5L Fermentation Jars with Weights & Air Lock Fermenting Kit for Sauerkraut Kimchi Kombucha and Pickles 2 Pack**SwiftSlot**£25.90**4.4★108 rev](https://www.amazon.co.uk/dp/B0DN6FQ89N)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**PIuertoRick Fermenting Jar 2 Pack with Airlock - 2L for Safe Fermentation for Kefir Kimchi Sauerkraut Sourdough Starter - Silicone Lids & Fermentation Weights - Fermentation Jars 2 Pack (Full Set)**PIuertoRick**£20.88**2 rev4mo ago](https://www.amazon.co.uk/dp/B0GV8XTTJW) [**YBCPACK 2 Pack 2L Glass Fermentation Jars with Weight & Airlocks-Wide Mouth**YBCPACK**£20.02**9 rev4mo ago](https://www.amazon.co.uk/dp/B0GR441CJD) [**AULEEP 2L Fermentation Jars with Fermentation Weights & Fermenting Airlock 2-Set Fermenting Kit for Ssauerkraut kimchi kombucha fruits vegetables pickled vegetables sourdough starter etc.**AULEEP**£22.62**20 rev8mo ago](https://www.amazon.co.uk/dp/B0G43SPH6J) [**Hejo 2L Fermentation Jar with Airlock and Screw Lids Fermentation Bucket with Adjustable Time Scale Kimchi Container Mead Making Kit Fermenting Kit for Kimchi Sauerkraut Kombucha Pickles**Hejo**£13.20**6 rev8mo ago](https://www.amazon.co.uk/dp/B0G1LMM37T) [**Fermentation Jars 2 Pack 2L Kimchi Container Fermenting Jar with Airlock Perfect for Fermentation Kimchi Sauerkraut Sourdough Starter Kefir Glass Jars with Lids**YUEYEE**£16.14**38 rev10mo ago](https://www.amazon.co.uk/dp/B0FHQ2SXDK)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**YBCPACK 2 Pack 2L Glass Fermentation Jars with Weight & Airlocks-Wide Mouth**YBCPACK**£20.02**4.1★**▲ 362%**](https://www.amazon.co.uk/dp/B0GR441CJD) [**PIuertoRick Fermenting Jar 2 Pack with Airlock - 2L for Safe Fermentation for Kefir Kimchi Sauerkraut Sourdough Starter - Silicone Lids & Fermentation Weights - Fermentation Jars 2 Pack (Full Set)**PIuertoRick**£20.88**4.5★**▲ 352%**](https://www.amazon.co.uk/dp/B0GV8XTTJW) [**volila Fermentation Jars 2.2 Litre 2 Pack Fermenting Jar with Airlock 1 Way Air Release Vent Ideal for Kimchi Jar Sourdough Jar and Sauerkraut Fermentation Jars**volila**£11.91**4.3★**▲ 234%**](https://www.amazon.co.uk/dp/B0D2DXNWZT) [**Fermentation Jars 2 Pack 2L Kimchi Container Fermenting Jar with Airlock Perfect for Fermentation Kimchi Sauerkraut Sourdough Starter Kefir Glass Jars with Lids**YUEYEE**£16.14**4.5★**▲ 189%**](https://www.amazon.co.uk/dp/B0FHQ2SXDK) [**AULEEP 2L Fermentation Jars with Fermentation Weights & Fermenting Airlock 2-Set Fermenting Kit for Ssauerkraut kimchi kombucha fruits vegetables pickled vegetables sourdough starter etc.**AULEEP**£22.62**4.1★**▲ 164%**](https://www.amazon.co.uk/dp/B0G43SPH6J)
**~~View all trending →~~**
## **What buyers say about fermentation jars**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**27%
*“Quality jar”*
**Size-Overall**10%
*“Good quality nice size”*
**Value For Money**9%
*“Good value”*
**Advertised Vs Actual Product**7%
*“Does the job”*
**Storage Capacity**7%
*“Large capacity”*
**Ease Of Use**5%
*“Ease of use”*
**Strength**5%
*“Strong and sturdy”*
**Taste-Overall**3%
*“He thinks this kimchi is delicious”*
**Thickness**2%
*“with thick”*
**Ease Of Cleaning**2%
*“clean them properly afterwards”*
### **What buyers complain about **
**Size-Overall**15%
*“Wish jar was larger”*
**Durability**10%
*“Breaks Easily”*
**Quality-Overall**9%
*“its not reliable at all”*
**Thickness**5%
*“is a slightly thicker glass”*
**Strength**4%
*“Flimsy inner seal”*
**Ease Of Use**4%
*“struggled to open it”*
**Instructions/User Manual/Troubleshooting**4%
*“they cant be bothered to tell you how to use”*
**Value For Money**3%
*“Disappointing for the price”*
**Ease Of Cleaning**3%
*“came off when cleaning”*
**Crispiness**3%
*“slimy, not crunchy”*
### **Top return reasons **
**Size-Overall**70%
**Defective Material/Parts**7%
**Shape/Style**3%
**Value For Money**3%
**Quality-Overall**2%
**Functionality-Overall**1%
**Color**1%
**Maintenance And Repair**1%
**Ease Of Use**1%
**Leak-Proof**1%
## **Common questions**
- **Is fermentation jars profitable to sell on Amazon United Kingdom?**
- The niche generates £152K/yr across 45 tracked products. 2 of 14 products launched in the last 360 days are still selling. 90-day search growth is -20.6%. Flapen's verdict: Worth a look (58/100).
- **How competitive is the fermentation jars niche?**
- 24 brands and 68 sellers compete. The top 5 products take 39% of clicks and top 5 brands hold 70% of demand.
- **What do buyers complain about in fermentation jars?**
- Top complaints mined from reviews: Size-Overall, Durability, Quality-Overall. The return rate is 0.4%.
- **When does demand for fermentation jars peak?**
- Demand peaks in Jan–Dec; the busiest month runs 1.9× the quietest.
- **What does it cost to enter the fermentation jars niche?**
- Listings span £3.45–£38.07; the average listing price is £17.55 (sweet spot $15–$100). The average incumbent carries 751 reviews — the moat a new listing must climb.
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