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C5 Window Envelopes

Fail

The top 5 brands take 100% of clicks, so C5 Window Envelopes is a Fail.

Flapen Score
37
37 / 100
Ranks 671 of 835 Stationery & Office Supplies niches · −10 vs the category median of 47
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.

37Fail
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

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.

Competition

Competition: brands, sellers & click share

The top 5 products take an estimated 83% of clicks. A locked shelf that new listings rarely crack.

£0£3K£5K£8K£10K1101001K10K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

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.

250150Spike '24Black Friday '24Spike '25Black Friday '25Holiday '25Spike '26DecMarJunAugNovMarMay

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.

33%of positive reviews mention “Quality-Overall”
0.1%of orders come back
“Great product - as described”
A buyer, on “Quality-Overall”33% of positive reviews mention the same topic

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

NegativePositive

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