---
title: "C6 Envelopes — £113K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/business-industry-science/c6-envelopes"
last_updated: "2026-08-01T00:45:54.044Z"
locale: en
meta:
description: "Niche score 54/100 · £113K/yr market · 161K searches/yr. Pricing outside the sweet spot ($6.81 avg) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 54/100 · £113K/yr market · 161K searches/yr. Pricing outside the sweet spot ($6.81 avg) keeps it on the watch list. Data updated Jul 2026."
"og:title": "C6 Envelopes — £113K/yr Amazon UK Niche (2026) - Flapen"
---
# **c6 envelopes**
**Worth a look**
Shows low returns (0.4%), but pricing outside the sweet spot ($6.81 avg) keeps it on the watch list.
Market size 27Growth 23Conversion 88Competition 79Returns 98Price range 20Avg price 19Brand share 75Review moat 76Quality gap 32
**Returns**
**Incredible****0.4%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****10.3%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Great****36%**
top-5 click share — an open shelf
**Review moat**
**Great****479.22**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Good****60%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Market size**
**Okay****£113K**
£113K/yr · 161K searches
**Growth**
**Bad****-4.2%**
90-day search growth — must beat 0% to launch
**Price range**
**Bad****£2.08–£18.22**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Bad****£6.81**
avg listing price — sweet spot $15–$100
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=uk&signal=no_dominant_brand "Top brand's click share < 20%") [** Low Review Barrier**](https://flapen.com/research/niches?market=uk&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United Kingdom niche tracking, c6 envelopes is a £113K/yr Amazon United Kingdom market (161K searches/yr). The top 5 brands hold 60% of demand. Demand peaks in Nov–Dec. Verdict: Worth a look — 54/100.
Data updated Jul 21, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **c6 envelopes market data**
- **Units sold / yr**
- **15K–20K**
- avg 250–500/product
- **Revenue / yr**
- **£102K–£136K**
- units × avg price
- **Conversion rate**
- **10.3%**
- **Avg BSR**
- **#107**
- **Page quality**
- **0%**
- **Prime**
- **86%**
- **Sponsored**
- **86%**
- **Out of stock**
- **4.8%**
- **Avg brand age**
- **44 months**
- **Avg seller age**
- **186 days**
## **Competition & brand share**
Clicks spread well past the top 5 (36% combined) — an open shelf where new products get seen.
**Brands**
**28 **▲rising
**Sellers**
**31**
**Top-5 brand share**
**60%**
Top 20: 94%
**Top-5 click share**
**36%**
Top 20: 74%
**Open market**
**33%**
- Karma Krafts19% - Triplast16% - Double Dragon9% - House of Card & Paper8% - JagerGreen8% - ARK7%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -4.2% search growth over the last 90 days.
6K4KHoliday '24Spike '25Holiday '25 seasonSepDecMarJunAugNovMarMay
Peak months: Nov, Dec · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/uk/business-industry-science/c6-envelopes/trend)
## **Top c6 envelopes search terms**
- **a6 envelopes**71K/yr+7.2%2.6% conv. - **c6 envelopes**42K/yr-11.3%5.2% conv. - **envelopes c6**13K/yr-3.7%6.0% conv. - **6x4 envelopes**11K/yr-34.0%2.2% conv. - **envelopes a6**7K/yr+0.0%3.1% conv. - **c6 envelopes white**6K/yr-11.3%11.5% conv. - **a6 envelopes white**5K/yr-8.4%7.3% conv. - **a6 envelope**3K/yr-12.3%2.6% conv. - **postcard envelopes**2K/yr-12.4%4.1% conv. [**All search terms **](https://flapen.com/research/uk/business-industry-science/c6-envelopes/search-terms)
## **Top c6 envelopes 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%£3K6%£7K9%£10K12%£14K1101001K10K 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**Double Dragon 50-Pack A6 C6 Manilla Hard Board Backed Envelopes | 162mm x 114mm | Please Do Not Bend Printed | Padded & Tamper-Proof | Self-Seal Closure**Double Dragon**£6.23**4.7★480 rev](https://www.amazon.co.uk/dp/B0DXY7Q984) [2**Triplast 100 x C6 White Self Seal Security Envelopes (Size: 114x162mm) | Fully Opaque Self Sealing & Printer Safe Mailing Paper Envelopes | Ideal for Everyday Home Office & Commercial Use**Triplast**£5.11**4.5★1,869 rev](https://www.amazon.co.uk/dp/B0B3S2SPD8) [3**100 x ARK C6 Premium White Greetings Card Envelope 100gsm 114mm x 162mm**ARK**£6.85**4.7★1,521 rev](https://www.amazon.co.uk/dp/B07TCN1ZPJ) [4**House of Card & Paper C6 Envelope - White (Pack of 25) HCP92**House of Card & Paper**£2.08**4.6★1,071 rev](https://www.amazon.co.uk/dp/B016Q4QAHA) [5**Karma Krafts C6 Ivory Envelopes 114 x 162mm 100gsm Gummed Envelopes for Cards & Invitations Pack of 50**Karma Krafts**£6.14**4.5★16 rev](https://www.amazon.co.uk/dp/B0DT4T3QMF)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Double Dragon 50-Pack A6 C6 Manilla Hard Board Backed Envelopes | 162mm x 114mm | Please Do Not Bend Printed | Padded & Tamper-Proof | Self-Seal Closure**Double Dragon**£6.23**480 rev1y ago](https://www.amazon.co.uk/dp/B0DXY7Q984) [**RFE Pack of 250 - C6 / A6 White Mailing Envelopes Self Seal for Posting mailing Home Office Ecommerce and Business 80gsm 114 x 162mm**RFE**£12.43**3 rev1y ago](https://www.amazon.co.uk/dp/B0DTRKSMCK) [**JAGERGREEN 50 Pack 4 x 6 Self Seal Envelopes White Blank A6 C6 Envelopes for Wedding Invitation Envelope 108 x 159mm 150gsm for Greeting Cards Birthday Baby Shower Thank You Cards Anniversary**JagerGreen**£10.63**625 rev1y ago](https://www.amazon.co.uk/dp/B0DQWVKF4H) [**JAGERGREEN 50 Pack 4 x 6 Self Seal Envelopes Green Blank A6 C6 Envelopes for Wedding Invitation Envelope 108 x 159mm 150gsm for Greeting Cards Birthday Baby Shower Thank You Cards Anniversary**JagerGreen**£10.56**625 rev1y ago](https://www.amazon.co.uk/dp/B0DQWGW4X3) [**Pack of 200 C6 Kraft Fleck Envelopes 114mm x 162mm Vintage Brown Self-Seal C6 Kraft Envelopes for Weddings Invitations Cards by Toniwa**Toniwa**£11.14**3 rev1y ago](https://www.amazon.co.uk/dp/B0DPCN2TBP)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Officely C6 Self Seal Wallet Envelopes 90 GSM 114mm x 162mm White - Pack of 25**Officely**£2.26**4.3★**▲ 291%**](https://www.amazon.co.uk/dp/B0D8M783YX) [**Pack of 200 C6 Kraft Fleck Envelopes 114mm x 162mm Vintage Brown Self-Seal C6 Kraft Envelopes for Weddings Invitations Cards by Toniwa**Toniwa**£11.14**5.0★**▲ 232%**](https://www.amazon.co.uk/dp/B0DPCN2TBP) [**100 Pack White Mini Envelopes 4x2.75 - Small Gift Card Envelopes for Weddings Baby Showers Thank You Notes RSVP Cards Photos and Any**amassan**£6.59**4.6★**▲ 210%**](https://www.amazon.co.uk/dp/B0C3QTVGVC) [**Karma Krafts C6 Recycled Kraft Fleck Envelopes 114 x 162mm 110gsm Gummed Brown Envelopes for A6 Cards & Invitations Pack of 25**Karma Krafts**£4.18**5.0★**▲ 115%**](https://www.amazon.co.uk/dp/B0D79HTG2D) [**RFE Pack of 250 - C6 / A6 White Mailing Envelopes Self Seal for Posting mailing Home Office Ecommerce and Business 80gsm 114 x 162mm**RFE**£12.43**4.3★**▲ 84%**](https://www.amazon.co.uk/dp/B0DTRKSMCK)
**~~View all trending →~~**
## **What buyers say about c6 envelopes**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**39%
*“Good quality”*
**Advertised Vs Actual Product**14%
*“Product was as advertised”*
**Value For Money**11%
*“good value”*
**Color**5%
*“nice colour”*
**Strength**5%
*“Strong, Secure and Perfect for Important Mail”*
**Size-Overall**4%
*“the size is good”*
**Thickness**3%
*“Thick”*
**Paper Quality**3%
*“Nice and thick paper”*
**Office Usability**3%
*“Ideal for bills”*
**Security**2%
*“Great for sending cards very secure”*
### **What buyers complain about **
**Color**14%
*“Not the colours shown”*
**Adhesion/Stickiness**13%
*“Will not stick down very well”*
**Quality-Overall**10%
*“Horrid quality”*
**Advertised Vs Actual Product**9%
*“Look nothing like the pictures”*
**Thickness**7%
*“Thickness was minimal although the appearance color was as described”*
**Ease Of Use**7%
*“making them unusable”*
**Paper Quality**3%
*“paper screwed up”*
**Ease Of Cleaning**3%
*“some are dirty”*
**Size-Overall**3%
*“Size not true 4x6 A6 UK size”*
**Display Colors**3%
*“All colours were washed out and muted”*
### **Top return reasons **
**Size-Overall**76%
**Color**8%
**Quality-Overall**3%
**Thin**2%
**Advertised Vs Actual Product**2%
**Display Colors**2%
**Value For Money**1%
**Adhesion/Stickiness**1%
**Ease Of Use**1%
**Strength**1%
## **Common questions**
- **Is c6 envelopes profitable to sell on Amazon United Kingdom?**
- The niche generates £113K/yr across 50 tracked products. 0 of 4 products launched in the last 360 days are still selling. 90-day search growth is -4.2%. Flapen's verdict: Worth a look (54/100).
- **How competitive is the c6 envelopes niche?**
- 28 brands and 31 sellers compete. The top 5 products take 36% of clicks and top 5 brands hold 60% of demand.
- **What do buyers complain about in c6 envelopes?**
- Top complaints mined from reviews: Color, Adhesion/Stickiness, Quality-Overall. The return rate is 0.4%.
- **When does demand for c6 envelopes peak?**
- Demand peaks in Nov–Dec; the busiest month runs 1.9× the quietest.
- **What does it cost to enter the c6 envelopes niche?**
- Listings span £2.08–£18.22; the average listing price is £6.81 (sweet spot $15–$100). The average incumbent carries 479 reviews — the moat a new listing must climb.
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