Is c5 window envelopes profitable to sell on Amazon United Kingdom?

The niche generates £26K/yr across 9 tracked products. 90-day search growth is -24.1%. Flapen's verdict: Skip it (37/100).

How competitive is the c5 window envelopes niche?

4 brands and 21 sellers compete. The top 5 products take 83% of clicks and top 5 brands hold 100% of demand.

When does demand for c5 window envelopes peak?

Demand is steady year-round — the busiest month runs 1.5× the quietest.

What does it cost to enter the c5 window envelopes niche?

Listings span £2.60–£19.81; the average listing price is £11.70 (sweet spot $15–$100). The average incumbent carries 326 reviews — the moat a new listing must climb.

c5 window envelopes

Skip it

Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.

Conversion

Incredible23.5%

search→purchase rate — share of searches ending in a sale

Returns

Incredible0.1%

return rate — above 5% kills the launch gate

Review moat

Great326.33

avg incumbent reviews — the moat a new listing must climb

Avg price

Okay£11.70

avg listing price — sweet spot $15–$100

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Price range

Okay£2.60–£19.81

cheapest to priciest tracked listing — scored on the share inside $15–$100

Competition

Bad83%

top-5 click share — a locked-up shelf

Growth

Bad-24.1%

90-day search growth — must beat 0% to launch

Market size

Bad£26K

£26K/yr · 9K searches

Brand share

Bad100%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United Kingdom niche tracking, c5 window envelopes is a £26K/yr Amazon United Kingdom market (9K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 37/100.

Data updated Jul 29, 2026 · scored weekly · How we score niches

c5 window envelopes market data

Units sold / yr: 3K–4K; avg 250–500/product
Revenue / yr: £35K–£47K; units × avg price
Conversion rate: 23.5%
Avg BSR: #55
Page quality: 0%
Prime: 78%
Sponsored: 89%
Out of stock: 0.0%
Avg brand age: 89 months
Avg seller age: 191 days

Competition & brand share

The top 5 products capture 83% of clicks — a locked-up shelf that new listings rarely crack.

Brands

4 flat

Sellers

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

83%

Top 20: 100%

Open market

Postmaster39%
Q-Connect24%
Blake21%
Globe Packaging16%
Open — no brand owns it (0%)

Demand & seasonality

Weekly Amazon search volume, last 103 weeks — -24.1% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.5×

Open Trend

Top c5 window envelopes search terms

c5 window envelopes5K/yr -22.4%21.3% conv.
a5 window envelopes self seal3K/yr -24.2%27.6% conv.
c5 window envelopes self seal 5002K/yr -27.8%26.5% conv.

All search terms

Top c5 window 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 9 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Postmaster C5 Window Envelopes 229 x 162 mm A5 90 GSM Self Seal White Bulk Business Pack of 500

Postmaster£14.624.6★315 rev

Q-Connect C5 Envelopes Window Pocket Self Seal 90 gsm White (Pack of 500)

Q-Connect£14.954.6★62 rev

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

Globe Packaging£5.434.6★1,659 rev

Postmaster A5 C5 Window Envelopes 229 x 162 mm 90 GSM Self Seal White 200 Pack

Postmaster£8.024.6★315 rev

Blake Purely Everyday 90 gsm C5 229 x 162 mm Pocket Self Seal Window Envelopes (12084) White - Pack of 500

Blake£19.394.6★287 rev

Newest

by launch date

Postmaster C5 Window Envelopes 229 x 162 mm A5 90 GSM Self Seal White Bulk Business Pack of 500

Postmaster£14.62315 rev

3y ago

Postmaster A5 C5 Window Envelopes 229 x 162 mm 90 GSM Self Seal White 200 Pack

Postmaster£8.02315 rev

4y ago

Blake Purely Everyday C5 229 x 162 mm 100 gsm Pocket Peel & Seal Window Envelopes (23084/100 PR) White - Pack of 100

Blake£6.8991 rev

8y ago

Q-Connect C5 Envelopes Window Pocket Self Seal 90gsm White (Pack of 500) 9000020

Q-Connect£13.6111 rev

10y ago

Blake Purely Everyday 90 gsm C5 229 x 162 mm Pocket Self Seal Window Envelopes (12084) White - Pack of 500

Blake£19.39287 rev

12y ago

What buyers say about c5 window envelopes

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall33%

“Great product - as described”

Advertised Vs Actual Product33%

“Does what was promised”

Value For Money25%

“Great value”

Size-Overall8%

“Fit for purpose”

Top return reasons

Advertised Vs Actual Product27%

Moist/Dry14%

Quality-Overall9%

Ethical Trade/Fair Trade9%

Defective Material/Parts9%

Size-Overall9%

Paper Quality9%

Material Quality9%

Adhesion/Stickiness5%

Common questions

Is c5 window envelopes profitable to sell on Amazon United Kingdom?: The niche generates £26K/yr across 9 tracked products. 90-day search growth is -24.1%. Flapen's verdict: Skip it (37/100).
How competitive is the c5 window envelopes niche?: 4 brands and 21 sellers compete. The top 5 products take 83% of clicks and top 5 brands hold 100% of demand.
When does demand for c5 window envelopes peak?: Demand is steady year-round — the busiest month runs 1.5× the quietest.
What does it cost to enter the c5 window envelopes niche?: Listings span £2.60–£19.81; the average listing price is £11.70 (sweet spot $15–$100). The average incumbent carries 326 reviews — the moat a new listing must climb.