a3 envelopes
Skip itA small market ($36K/yr) — this niche doesn't clear our bar today.
Returns
Incredible0.3%return rate — above 5% kills the launch gate
Conversion
Great9.2%search→purchase rate — share of searches ending in a sale
Review moat
Okay1,500.31avg incumbent reviews — the moat a new listing must climb
Avg price
Okay£9.53avg listing price — sweet spot $15–$100
Price range
Okay£3.39–£19.71cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Okay69%top-5 click share — leaders hold, buyers still browse
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
Growth
Bad-7.5%90-day search growth — must beat 0% to launch
Brand share
Bad95%top-5 brand share — brand-locked demand
Market size
Bad£36K£36K/yr · 41K searches
According to Flapen's Amazon United Kingdom niche tracking, a3 envelopes is a £36K/yr Amazon United Kingdom market (41K searches/yr). The top 5 brands hold 95% of demand. Demand peaks in Nov–Dec. Verdict: Skip it — 36/100.
Data updated Jul 21, 2026 · scored weekly · How we score niches
a3 envelopes market data
- Units sold / yr
- 4K–5K
- avg 100–250/product
- Revenue / yr
- £38K–£48K
- units × avg price
- Conversion rate
- 9.2%
- Avg BSR
- #18
- Page quality
- 0%
- Prime
- 69%
- Sponsored
- 85%
- Out of stock
- 1.3%
- Avg brand age
- 50 months
- Avg seller age
- 176 days
Competition & brand share
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.Brands
7 falling
Sellers
24
Top-5 brand share
95%
Top 20: 100%
Top-5 click share
69%
Top 20: 100%
Open market
2%
- Double Dragon45%
- Blake19%
- Triplast17%
- Q-Connect9%
- AKAR5%
- ARPAN3%
- Open — no brand owns it (1 brand, 2%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -7.5% search growth over the last 90 days.Peak months: Nov, Dec · busiest ÷ quietest = 1.7×
Top a3 envelopes search terms
- a3 envelopes21K/yr
- a3 envelopes hardback6K/yr
- c3 envelopes5K/yr
- a3 envelope3K/yr
- a3 do not bend envelopes3K/yr
- a3 hardback envelopes3K/yr
Top a3 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.
All 13 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Double Dragon 10-Pack A3 C3 Brown/Manilla Strong Hard Board Backed Self-Seal Envelopes - 457mm x 324mm - Printed Please Do Not Bend Envelope
Double Dragon£5.774.7★480 rev
Blake Purely Everyday C4 324 x 229 mm 90 gsm Self Seal Pocket Envelopes (12891/50 PR) White - Pack of 50
Blake£4.934.6★4,982 rev
Q-Connect C3 Envelope 457x324mm Pocket Self Seal 115gsm Manilla (Pack of 125)
Q-Connect£19.714.5★121 rev
Double Dragon 20-Pack A3 C3 Manilla Hard Board Backed Envelopes | 458mm x 324mm | Please Do Not Bend Printed | Padded & Tamper-Proof | Self-Seal Closure
Double Dragon£8.314.7★480 rev
Triplast 50 x A3 C3 Manilla Hard Board Back Envelopes (457x324mm) - Cardboard Backed Mailers with Peel & Seal Strip - Rigid Do Not Bend Envelopes for Mailing Posting Shipping & Storing Documents
Triplast£18.264.6★955 rev
Newest
by launch dateDouble Dragon 10-Pack A3 C3 Brown/Manilla Strong Hard Board Backed Self-Seal Envelopes - 457mm x 324mm - Printed Please Do Not Bend Envelope
Double Dragon£5.77480 rev
Double Dragon 20-Pack A3 C3 Manilla Hard Board Backed Envelopes | 458mm x 324mm | Please Do Not Bend Printed | Padded & Tamper-Proof | Self-Seal Closure
Double Dragon£8.31480 rev
Double Dragon 50-Pack A3 C3 Manilla Hard Board Backed Envelopes | 458mm x 324mm | Please Do Not Bend Printed | Padded & Tamper-Proof | Self-Seal Closure
Double Dragon£15.41480 rev
![AKAR A3 C3 (45x32 cm - 457x324 mm) Printed Manilla Hard-Backed Envelope with Card [Pack of 5]](https://m.media-amazon.com/images/I/31HfWI+s9RL.jpg)
AKAR A3 C3 (45x32 cm - 457x324 mm) Printed Manilla Hard-Backed Envelope with Card [Pack of 5]
AKAR£4.7338 rev
Evour A4/C4 Self Seal White Pocket Envelopes 229x324mm 100 GSM No Window for Home Office and Business Mailing Pack of 25
evour£5.921,608 rev
Trending
90-day click momentumDouble Dragon 50-Pack A3 C3 Manilla Hard Board Backed Envelopes | 458mm x 324mm | Please Do Not Bend Printed | Padded & Tamper-Proof | Self-Seal Closure
Double Dragon£15.414.7★
Double Dragon 10-Pack A3 C3 Brown/Manilla Strong Hard Board Backed Self-Seal Envelopes - 457mm x 324mm - Printed Please Do Not Bend Envelope
Double Dragon£5.774.7★
Triplast 50 x A3 C3 Manilla Hard Board Back Envelopes (457x324mm) - Cardboard Backed Mailers with Peel & Seal Strip - Rigid Do Not Bend Envelopes for Mailing Posting Shipping & Storing Documents
Triplast£18.264.6★
Q-Connect C3 Envelope 457x324mm Pocket Self Seal 115gsm Manilla (Pack of 125)
Q-Connect£19.714.5★
Blake Purely Everyday C4 324 x 229 mm 90 gsm Gummed Pocket Envelopes (13854/25 PR) Manilla - Pack of 25
Blake£3.674.6★
What buyers say about a3 envelopes
What buyers praise and complain about, mined from review topics.What buyers love
“Decent value for money”
“Good quality”
“As described”
“Fit was good”
“Robust, good value too”
“Cant remember how many times I have purchased these envelopes - they are great, they look good, strong paper and self seal is strong”
“nice to write on”
“Strong, well-padded and sturdy”
“the seal is sticky also”
What buyers complain about
“Very poor quality”
“Too large”
“doesn't stick down well so have to use sellotape or they would come open in the mail”
“could be slightly sturdier”
Top return reasons
Common questions
- Is a3 envelopes profitable to sell on Amazon United Kingdom?
- The niche generates £36K/yr across 13 tracked products. 90-day search growth is -7.5%. Flapen's verdict: Skip it (36/100).
- How competitive is the a3 envelopes niche?
- 7 brands and 24 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 95% of demand.
- What do buyers complain about in a3 envelopes?
- Top complaints mined from reviews: Quality-Overall, Size-Overall, Adhesion/Stickiness. The return rate is 0.3%.
- When does demand for a3 envelopes peak?
- Demand peaks in Nov–Dec; the busiest month runs 1.7× the quietest.
- What does it cost to enter the a3 envelopes niche?
- Listings span £3.39–£19.71; the average listing price is £9.53 (sweet spot $15–$100). The average incumbent carries 1,500 reviews — the moat a new listing must climb.