---
title: "A5 Envelopes — £538K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/stationery-office-supplies/a5-envelopes"
last_updated: "2026-07-31T08:56:16.670Z"
locale: en
meta:
description: "Niche score 44/100 · £538K/yr market · 396K searches/yr · £7.81 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 44/100 · £538K/yr market · 396K searches/yr · £7.81 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "A5 Envelopes — £538K/yr Amazon UK Niche (2026) - Flapen"
---
# **a5 envelopes**
**Skip it**
A concentrated shelf (top 5 take 81% of clicks) — this niche doesn't clear our bar today.
Market size 61Growth 19Conversion 98Competition 16Returns 99Price range 26Avg price 22Brand share 17Review moat 45Quality gap 32
**Returns**
**Incredible****0.2%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****17.4%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Good****£538K**
£538K/yr · 396K searches
**Review moat**
**Okay****2,026.42**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Price range**
**Okay****£3.23–£19.10**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Bad****£7.81**
avg listing price — sweet spot $15–$100
**Growth**
**Bad****-11.4%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****93%**
top-5 brand share — brand-locked demand
**Competition**
**Bad****81%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United Kingdom niche tracking, a5 envelopes is a £538K/yr Amazon United Kingdom market (396K searches/yr). The top 5 brands hold 93% of demand. Demand peaks in Dec. Verdict: Skip it — 44/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **a5 envelopes market data**
- **Units sold / yr**
- **60K–80K**
- avg 5,000–6,000/product
- **Revenue / yr**
- **£469K–£625K**
- units × avg price
- **Conversion rate**
- **17.4%**
- **Avg BSR**
- **#91**
- **Page quality**
- **0%**
- **Prime**
- **83%**
- **Sponsored**
- **92%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **46 months**
- **Avg seller age**
- **179 days**
## **Competition & brand share**
The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**8 **▼falling
**Sellers**
**50**
**Top-5 brand share**
**93%**
Top 20: 100%
**Top-5 click share**
**81%**
Top 20: 100%
**Open market**
**4%**
- Triplast35% - Tallon34% - Blake17% - Postmaster4% - FIRST CHOICE KAYA3% - evour3% - Open — no brand owns it (2 brands, 4%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -11.4% search growth over the last 90 days.
13K8KHoliday '24Holiday '25 seasonSepDecMarJunAugNovMarMay
Peak months: Dec · busiest ÷ quietest = 1.8×
[**Open Trend **](https://flapen.com/research/uk/stationery-office-supplies/a5-envelopes/trend)
## **Top a5 envelopes search terms**
- **a5 envelopes**160K/yr-7.5%12.9% conv. - **envelopes a5**61K/yr-4.8%12.5% conv. - **c5 envelopes**69K/yr-13.3%6.9% conv. - **a5 envelopes peel and seal**17K/yr-11.6%20.3% conv. - **c5 envelopes peel and seal**17K/yr-33.3%9.6% conv. - **a5 envelope**10K/yr-5.5%6.2% conv. - **envelopes c5**13K/yr-50.7%8.0% conv. - **a5 size envelopes**7K/yr-3.4%4.2% conv. - **a5 white envelopes**7K/yr-5.6%14.1% conv. - **c5 envelope**5K/yr-12.7%5.6% conv. [**All search terms **](https://flapen.com/research/uk/stationery-office-supplies/a5-envelopes/search-terms)
## **Top a5 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%10%£54K20%£108K30%£162K40%£215K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 12 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**C5 / A5 White Peel & Seal Envelopes Pack of 30**Tallon**£3.29**4.5★3,144 rev](https://www.amazon.co.uk/dp/B01D1XKDUO) [2**Triplast 50 x C5 White Self Seal Security Envelopes (Size: 229x164mm) | Fully Opaque Self Sealing & Printer Safe Mailing Paper Envelopes | Ideal for Everyday Home Office & Commercial Use**Triplast**£4.36**4.5★1,900 rev](https://www.amazon.co.uk/dp/B0B3S1JMRQ) [3**Triplast 20 x C5 White Self Seal Security Envelopes (Size: 229x164mm) | Fully Opaque Self Sealing & Printer Safe Mailing Paper Envelopes | Ideal for Everyday Home Office & Commercial Use**Triplast**£3.23**4.5★1,900 rev](https://www.amazon.co.uk/dp/B0B697HF4Y) [4**Blake Purely Everyday C5 229 x 162 mm 90 gsm Pocket Self Seal Envelopes (13893/50 PR) White - Pack of 50**Blake**£3.35**4.7★4,847 rev](https://www.amazon.co.uk/dp/B0122Q1O7C) [5**Triplast 100 x C5 White Self Seal Security Envelopes (Size: 229x164mm) | Fully Opaque Self Sealing & Printer Safe Mailing Paper Envelopes | Ideal for Everyday Home Office & Commercial Use**Triplast**£6.65**4.5★1,900 rev](https://www.amazon.co.uk/dp/B0B3S12LMX)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**RFE Pack of 100 - C5 / A5 White Mailing Envelopes Self Seal for Posting mailing Home Office Ecommerce and Business 90gsm 229 x 162mm**RFE**£9.94**6 rev1y ago](https://www.amazon.co.uk/dp/B0DTRX89DF) [**Karma Krafts C5 Ivory Cream Envelopes 162 x 229mm 100gsm Gummed Diamond Flap Fits A5 Cards Wedding & Invitation Envelopes Pack of 25**Karma Krafts**£6.45**44 rev3y ago](https://www.amazon.co.uk/dp/B0C9X97QZ1) [**Postmaster A5 Envelopes 229 x 162 mm C5 90 GSM Self Seal White 500 Pack**Postmaster**£16.52**1,365 rev3y ago](https://www.amazon.co.uk/dp/B0BWZ3P73K) [**Triplast 20 x C5 White Self Seal Security Envelopes (Size: 229x164mm) | Fully Opaque Self Sealing & Printer Safe Mailing Paper Envelopes | Ideal for Everyday Home Office & Commercial Use**Triplast**£3.23**1,900 rev4y ago](https://www.amazon.co.uk/dp/B0B697HF4Y) [**Triplast 50 x C5 White Self Seal Security Envelopes (Size: 229x164mm) | Fully Opaque Self Sealing & Printer Safe Mailing Paper Envelopes | Ideal for Everyday Home Office & Commercial Use**Triplast**£4.36**1,900 rev4y ago](https://www.amazon.co.uk/dp/B0B3S1JMRQ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Triplast 100 x C5 White Self Seal Security Envelopes (Size: 229x164mm) | Fully Opaque Self Sealing & Printer Safe Mailing Paper Envelopes | Ideal for Everyday Home Office & Commercial Use**Triplast**£6.65**4.5★**▲ 86%**](https://www.amazon.co.uk/dp/B0B3S12LMX) [**Karma Krafts C5 Ivory Cream Envelopes 162 x 229mm 100gsm Gummed Diamond Flap Fits A5 Cards Wedding & Invitation Envelopes Pack of 25**Karma Krafts**£6.45**4.3★**▲ 79%**](https://www.amazon.co.uk/dp/B0C9X97QZ1) [**RFE Pack of 100 - C5 / A5 White Mailing Envelopes Self Seal for Posting mailing Home Office Ecommerce and Business 90gsm 229 x 162mm**RFE**£9.94**4.8★**▲ 75%**](https://www.amazon.co.uk/dp/B0DTRX89DF) [**Postmaster A5 Envelopes 229 x 162 mm C5 90 GSM Self Seal White 500 Pack**Postmaster**£16.52**4.6★**▲ 39%**](https://www.amazon.co.uk/dp/B0BWZ3P73K) [**FIRST CHOICE KAYA 25 50 100 DL White Mailing Envelopes Self Seal for Posting mailing Home Office and Ecommerce Peel and Seal (100)**FIRST CHOICE KAYA**£5.70**4.5★**— 5%**](https://www.amazon.co.uk/dp/B09YVGPKLK)
**~~View all trending →~~**
## **What buyers say about a5 envelopes**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**30%
*“Great quality, arrived quickly”*
**Value For Money**22%
*“Fair price”*
**Advertised Vs Actual Product**17%
*“Do exactly as expected”*
**Size-Overall**6%
*“The size is great”*
**Adhesion/Stickiness**5%
*“Always good quality stick fine”*
**Paper Quality**4%
*“Good substantial paper”*
**Strength**2%
*“strong envelopes”*
**Correct Contents**2%
*“Good lot”*
**Color**2%
*“a great white colour”*
**Ease Of Use**2%
*“Easy to use”*
### **What buyers complain about **
**Quality-Overall**29%
*“Average quality”*
**Thickness**16%
*“that shows in the thickness of the paper so are a lower quality”*
**Adhesion/Stickiness**14%
*“Stickiness was non existent”*
**Paper Quality**7%
*“that shows in the thickness of the paper so are a lower quality”*
**Size-Overall**6%
*“Large”*
**Value For Money**6%
*“The stamp is the expensive bit”*
**Thin**5%
*“Very thin”*
**Strength**4%
*“getting better quality as these are flimsy”*
**Ease Of Use**3%
*“Tends to lift easily”*
**Weight Light**2%
*“Too lightweight”*
### **Top return reasons **
**Size-Overall**69%
**Quality-Overall**10%
**Thin**6%
**Adhesion/Stickiness**4%
**Advertised Vs Actual Product**2%
**Color**2%
**Paper Quality**1%
**Thickness**1%
**Functionality-Overall**1%
**Ease Of Cleaning**1%
## **Common questions**
- **Is a5 envelopes profitable to sell on Amazon United Kingdom?**
- The niche generates £538K/yr across 12 tracked products. 90-day search growth is -11.4%. Flapen's verdict: Skip it (44/100).
- **How competitive is the a5 envelopes niche?**
- 8 brands and 50 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 93% of demand.
- **What do buyers complain about in a5 envelopes?**
- Top complaints mined from reviews: Quality-Overall, Thickness, Adhesion/Stickiness. The return rate is 0.2%.
- **When does demand for a5 envelopes peak?**
- Demand peaks in Dec; the busiest month runs 1.8× the quietest.
- **What does it cost to enter the a5 envelopes niche?**
- Listings span £3.23–£19.10; the average listing price is £7.81 (sweet spot $15–$100). The average incumbent carries 2,026 reviews — the moat a new listing must climb.
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