C5 Window Envelopes
FailThe top 5 brands take 100% of clicks, so C5 Window Envelopes is a Fail.
- Flapen Score
- 37 / 100Ranks 671 of 835 Stationery & Office Supplies niches · −10 vs the category median of 4737
- Market size
- £26K/yr9K searches / yr
- 90-day growth
- -24.1%search demand this quarter
- Competition
- 83%top-5 click share · 4 brands · 21 sellers
Flapen Score
C5 Window Envelopes against its category
The dotted line is the Stationery & Office Supplies average. Past it, C5 Window Envelopes is stronger. Inside it, weaker.
Market
The C5 Window Envelopes market on Amazon at a glance
Shoppers on Amazon United Kingdom searched for C5 Window Envelopes 9K times last year and spent an estimated £26K. All 4 brands take every click. Flapen scores it 37 out of 100, a Fail.
01 · Demand
An estimated 23.5% of those searches ended in a purchase.
Shoppers searched for this 9K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. An estimated 23.5% of those searches ended in a purchase. Searches in the last 90 days moved -24.1% against the 90 days before. Searches, conversion and average price together put the market at an estimated £26K a year.
- Searches, last 12 months
- 9K
- Growth, 90 days vs prior 90
- -24.1%
- Conversion, latest week
- 23.5%
- Market size, estimated
- £26Ka year
- Peak month
- March1.5× the quietest month
- Top search term
- c5 window envelopes5K searches a year
02 · Price
A sale here is worth £11.70.
Listings sell for £11.70 on average, from £2.60 to £19.81. Amazon reports units sold in ranges. This niche sold 3K to 4K a year. The average listing sells 250 to 500 of them. At £11.70 that is £3K to £6K a year per listing.
- Average price
- £11.70under the $15 to $100 sweet spot
- Price range
- £2.60–£19.81
- Amazon United Kingdom median price
- £12.12across 27,606 niches
- Units sold a year
- 3K–4K
- Units per listing a year
- 250–500
- Revenue per listing a year
- £3K–£6K
- Returns
- 0.1%of orders · Amazon United Kingdom median 0.6%
03 · Entry bar
The bar here is low.
89% of listings pay for placement with sponsored ads. 78% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #55 within Envelopes & Mailing Supplies. It carries 326 reviews at 4.49 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 89%
- Prime listings
- 78%
- Out of stock, average day
- 0.0%
- Average rank
- #55in Envelopes & Mailing Supplies
- Average rating
- 4.49 starsAmazon United Kingdom average 4.36 stars
- Average reviews
- 326per listing
- Listings tracked
- 9
04 · Newcomers
Brands here are established.
The brands on the shelf have sold for 89 months on average, so the names here are established.
- Launched, last 12 months
- 0
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 89 months
Products
Top C5 Window Envelopes products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 29, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Postmaster C5 Window Envelopes 229 x 162 mm A5 90 GSM Self Seal White Bulk Business Pack of 500
- Price
- £14.62
- Rating
- 4.6/5
- Reviews
- 315
- Age
- 3y ago

Q-Connect C5 Envelopes Window Pocket Self Seal 90 gsm White (Pack of 500)
- Price
- £14.95
- Rating
- 4.6/5
- Reviews
- 62
- Age
- 19y ago

GP Globe Packaging 50 x C5 A5 White Window Self Seal Paper Envelopes (Size: 229x164mm) - Printer Safe & Fully Opaque - Security Mailing Envelopes for Home Office & Business Use
- Price
- £5.43
- Rating
- 4.6/5
- Reviews
- 1,659
- Age
- 14y ago

Postmaster A5 C5 Window Envelopes 229 x 162 mm 90 GSM Self Seal White 200 Pack
- Price
- £8.02
- Rating
- 4.6/5
- Reviews
- 315
- Age
- 4y ago

Blake Purely Everyday 90 gsm C5 229 x 162 mm Pocket Self Seal Window Envelopes (12084) White - Pack of 500
- Price
- £19.39
- Rating
- 4.6/5
- Reviews
- 287
- Age
- 12y ago
Trending
estimated 90-day click momentum
Blake Purely Everyday C5 162 x 229 mm 90 gsm Self Seal Wallet High Window Envelopes (1709) White - Pack of 500
- Price
- £19.81
- Rating
- 4.2/5
- Reviews
- 8
- Age
- 12y ago

Blake Purely Everyday C5 229 x 162 mm 90 gsm Self Seal Window Pocket Envelopes (13084/25 PR) White - Pack of 25
- Price
- £2.60
- Rating
- 4.5/5
- Reviews
- 189
- Age
- 12y ago

Blake Purely Everyday 90 gsm C5 229 x 162 mm Pocket Self Seal Window Envelopes (12084) White - Pack of 500
- Price
- £19.39
- Rating
- 4.6/5
- Reviews
- 287
- Age
- 12y ago

Q-Connect C5 Envelopes Window Pocket Self Seal 90 gsm White (Pack of 500)
- Price
- £14.95
- Rating
- 4.6/5
- Reviews
- 62
- Age
- 19y ago

Postmaster A5 C5 Window Envelopes 229 x 162 mm 90 GSM Self Seal White 200 Pack
- Price
- £8.02
- Rating
- 4.6/5
- Reviews
- 315
- Age
- 4y ago
Newest
by launch date
Postmaster C5 Window Envelopes 229 x 162 mm A5 90 GSM Self Seal White Bulk Business Pack of 500
- Price
- £14.62
- Rating
- 4.6/5
- Reviews
- 315
- Age
- 3y ago

Postmaster A5 C5 Window Envelopes 229 x 162 mm 90 GSM Self Seal White 200 Pack
- Price
- £8.02
- Rating
- 4.6/5
- Reviews
- 315
- Age
- 4y ago

Blake Purely Everyday C5 229 x 162 mm 100 gsm Pocket Peel & Seal Window Envelopes (23084/100 PR) White - Pack of 100
- Price
- £6.89
- Rating
- 4.6/5
- Reviews
- 91
- Age
- 8y ago

Q-Connect C5 Envelopes Window Pocket Self Seal 90gsm White (Pack of 500) 9000020
- Price
- £13.61
- Rating
- 4.1/5
- Reviews
- 11
- Age
- 10y ago

Blake Purely Everyday 90 gsm C5 229 x 162 mm Pocket Self Seal Window Envelopes (12084) White - Pack of 500
- Price
- £19.39
- Rating
- 4.6/5
- Reviews
- 287
- Age
- 12y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 83% of clicks. A locked shelf that new listings rarely crack.
Brands
4 flat
Sellers
21
Est. top-5 brand share
100%
Top 20: 100%
Est. top-5 click share
83%
Top 20: 100%
Open market
0%
- Postmaster39%
- Q-Connect24%
- Blake21%
- Globe Packaging16%
- Open — no brand owns it (0%)
Demand
C5 Window Envelopes search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.5×
Search terms
Top C5 Window Envelopes search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- c5 window envelopes5K/yr
- a5 window envelopes self seal3K/yr
- c5 window envelopes self seal 5002K/yr
Reviews and returns
What reviews say buyers love and hate about C5 Window Envelopes
We read the reviews and the return reasons for every product selling here.
“Great product - as described”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
10 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common C5 Window Envelopes questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









