large letter postal boxes
Skip itPrices mostly outside the sweet spot ($4.56–$14.95) — this niche doesn't clear our bar today.
Returns
Incredible0.5%return rate — above 5% kills the launch gate
Review moat
Good755.48avg incumbent reviews — the moat a new listing must climb
Conversion
Good5.0%search→purchase rate — share of searches ending in a sale
Competition
Good52%top-5 click share — leaders hold, buyers still browse
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Brand share
Okay78%top-5 brand share — brands hold most of the demand
Avg price
Bad£8.78avg listing price — sweet spot $15–$100
Growth
Bad-14.7%90-day search growth — must beat 0% to launch
Market size
Bad£42K£42K/yr · 97K searches
Price range
Bad£4.56–£14.95cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, large letter postal boxes is a £42K/yr Amazon United Kingdom market (97K searches/yr). The top 5 brands hold 78% of demand. Demand peaks in Nov–Dec. Verdict: Skip it — 42/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
large letter postal boxes market data
- Units sold / yr
- 5K–6K
- avg 100–250/product
- Revenue / yr
- £44K–£53K
- units × avg price
- Conversion rate
- 5.0%
- Avg BSR
- #164
- Page quality
- 0%
- Prime
- 33%
- Sponsored
- 56%
- Out of stock
- 3.0%
- Avg brand age
- 47 months
- Avg seller age
- 182 days
Competition & brand share
The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.Brands
11 falling
Sellers
25
Top-5 brand share
78%
Top 20: 100%
Top-5 click share
52%
Top 20: 93%
Open market
15%
- AKAR28%
- Triplast23%
- Generic12%
- Parcel Pack9%
- STRBOXONG7%
- MEG4TEC6%
- Open — no brand owns it (5 brands, 15%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -14.7% search growth over the last 90 days.Peak months: Nov, Dec · busiest ÷ quietest = 2.0×
Top large letter postal boxes search terms
- large letter postal boxes28K/yr
- letterbox boxes16K/yr
- large letter boxes11K/yr
- c6 postal boxes7K/yr
- c5 postal boxes8K/yr
- large letter box7K/yr
- letter box boxes6K/yr
- pip boxes4K/yr
- cardboard letter box3K/yr
- a5 postal boxes3K/yr
Top large letter postal boxes 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 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Triplast C6 160 x 110 x 20 mm White PIP Cardboard Large Letter Postal Box for Royal Mail (Pack of 50)
Triplast£8.914.4★3,182 rev
AKAR Corrugated Manila Large Letter Postal Box C5 A5 PIP Boxes Royal Mail
AKAR£7.734.6★583 rev
100 x C5 A5 PIP Box Shipping Mail Postal Large Letter Boxes - Size: 235x165x22mm Sold by MEG4TEC
Generic£10.664.3★452 rev
Generic 50 x C5 A5 PIP Box Shipping Mail Postal Large Letter Boxes - Size: 235x165x22mm Sold by MEG4TEC
Parcel Pack£7.264.3★3,328 rev
Triplast C6 160 x 110 x 20 mm White PIP Cardboard Large Letter Postal Box for Royal Mail (Pack of 10)
Triplast£5.184.4★3,182 rev
Newest
by launch date
C4 Large Letter Postal Boxes 100 Pack Strong Corrugated Cardboard Mailing Boxes PIP Large Letter Size Flat Packed Shipping Boxes for Documents E-commerce
Generic£14.950 rev
C6 A6 Postal Pip Boxes - Large Letter & Flat Pack Boxes Size 16.3cm x 11.2cm x 2cm - Pack of 25 (White)
iDEALS UK PACKAGING LTD£8.207 rev
iDEALS UK PACKAGING LTD PINK C5 A5 size box large letter cardboard shipping mailing postal PIP. Internal size: 23cm x 16cm x 2cm (25)
iDEALS UK PACKAGING LTD£10.7132 rev
C6 A6 PiP Shipping Mailing Postal Large Letter box 160 x 111 x 19mm (16 x 11 x 1.9 cm) - Eco-Friendly and 100% Recyclable. (50)
iDEALS UK PACKAGING LTD£8.4963 rev
C6 A6 PiP Shipping Mailing Postal Large Letter box 160 x 111 x 19mm (16 x 11 x 1.9 cm) - Eco-Friendly and 100% Recyclable. (100)
iDEALS UK PACKAGING LTD£13.0463 rev
Trending
90-day click momentumC4 Large Letter Postal Boxes 100 Pack Strong Corrugated Cardboard Mailing Boxes PIP Large Letter Size Flat Packed Shipping Boxes for Documents E-commerce
Generic£14.950.0★
Triplast C6 160 x 110 x 20 mm White PIP Cardboard Large Letter Postal Box for Royal Mail (Pack of 10)
Triplast£5.184.4★
TGL PACKAGING C5 / A5 (218x159x20mm) Royal Mail Brown Large Letter Cardboard Postal Mailing PiP Boxes (10)
Trendwearz£5.794.6★
C6 A6 Postal Pip Boxes - Large Letter & Flat Pack Boxes Size 16.3cm x 11.2cm x 2cm - Pack of 25 (White)
iDEALS UK PACKAGING LTD£8.204.7★
C6 A6 PiP Shipping Mailing Postal Large Letter box 160 x 111 x 19mm (16 x 11 x 1.9 cm) - Eco-Friendly and 100% Recyclable. (50)
iDEALS UK PACKAGING LTD£8.494.6★
What buyers say about large letter postal boxes
What buyers praise and complain about, mined from review topics.What buyers love
“perfect size”
“Excellent product”
“Great value”
“Very sturdy”
“Works as advertised”
“easy to assemble”
“Easy sending”
“Great boxes for the perfect wedding invitations”
“Great for A4 frames”
“Perfect for use”
What buyers complain about
“Bad quality”
“they are flimsy”
“Thin”
“dont assemble well”
“Overall I doubt its fit for the intended purpose”
“you could easily bend them inside out”
“as you will see its not very easy”
“Shocking quality, difficult to fold as hardly any usable fold lines and don't stay in shape”
“not good value as you will definitely need additional postal bag or excessive tape to make sure your item is safely delivered”
“so they don't fold properly”
Top return reasons
Common questions
- Is large letter postal boxes profitable to sell on Amazon United Kingdom?
- The niche generates £42K/yr across 27 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -14.7%. Flapen's verdict: Skip it (42/100).
- How competitive is the large letter postal boxes niche?
- 11 brands and 25 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 78% of demand.
- What do buyers complain about in large letter postal boxes?
- Top complaints mined from reviews: Quality-Overall, Strength, Thickness. The return rate is 0.5%.
- When does demand for large letter postal boxes peak?
- Demand peaks in Nov–Dec; the busiest month runs 2.0× the quietest.
- What does it cost to enter the large letter postal boxes niche?
- Listings span £4.56–£14.95; the average listing price is £8.78 (sweet spot $15–$100). The average incumbent carries 755 reviews — the moat a new listing must climb.