mailing bags 12x16
Skip itPrices mostly outside the sweet spot ($2.67–$8.18) — this niche doesn't clear our bar today.
Returns
Incredible0.1%return rate — above 5% kills the launch gate
Conversion
Incredible14.5%search→purchase rate — share of searches ending in a sale
Competition
Okay63%top-5 click share — leaders hold, buyers still browse
Growth
Okay+2.2%90-day search growth — must beat 0% to launch
Brand share
Okay88%top-5 brand share — brands hold most of the demand
Review moat
Okay3,814.73avg incumbent reviews — the moat a new listing must climb
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Market size
Bad£62K£62K/yr · 82K searches
Avg price
Bad£5.21avg listing price — sweet spot $15–$100
Price range
Bad£2.67–£8.18cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, mailing bags 12x16 is a £62K/yr Amazon United Kingdom market (82K searches/yr). The top 5 brands hold 88% of demand. Demand peaks in Oct–Nov. Verdict: Skip it — 39/100.
Data updated Jul 21, 2026 · scored weekly · How we score niches
mailing bags 12x16 market data
- Units sold / yr
- 10K–13K
- avg 250–500/product
- Revenue / yr
- £52K–£65K
- units × avg price
- Conversion rate
- 14.5%
- Avg BSR
- #13
- Page quality
- 0%
- Prime
- 95%
- Sponsored
- 95%
- Out of stock
- 12.4%
- Avg brand age
- 50 months
- Avg seller age
- 177 days
Competition & brand share
The top 5 products take 63% of clicks — established leaders, but buyers still shop beyond them.Brands
10 falling
Sellers
16
Top-5 brand share
88%
Top 20: 100%
Top-5 click share
63%
Top 20: 98%
Open market
8%
- iSOUL52%
- Switory12%
- delka10%
- Double Dragon9%
- Straame5%
- 1ABOVE3%
- Open — no brand owns it (4 brands, 8%)
Demand & seasonality
Weekly Amazon search volume, last 83 weeks — +2.2% search growth over the last 90 days.Peak months: Oct, Nov · busiest ÷ quietest = 2.2×
Top mailing bags 12x16 search terms
- 12x16 mailing bags21K/yr
- mailing bags 12x1619K/yr
- 12 x 16 mailing bags14K/yr
- postage bags 12 x 16 inch11K/yr
- parcel bags 12x165K/yr
- medium mailing bags 12x163K/yr
- mail bags 12 x 164K/yr
- parcel bags 12 x 16 inch6K/yr
Top mailing bags 12x16 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 22 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Mailing Bags iSOUL 50 Pcs Shipping Poly Postal Self Seal Bags in Size 12 x 16 Inch Size Small Mailing Bags Postage Packaging Bags 305mm to 407mm
iSOUL£4.834.7★8,846 rev
Mailing Bags iSOUL 100 Pcs Shipping Poly Postal Self Seal Bags in Size 12 x 16 Inch Size Small Mailing Bags Postage Packaging Bags 305mm to 407mm
iSOUL£6.224.7★8,846 rev
Switory Parcel Bags Mailing 12X16 Inch Postal Bags Self Seal Waterproof Shipping Mailers Mailing Bag for Clothes Envelopes Postage Bag for Packaging 50Pcs (Grey)
Switory£4.934.9★149 rev
Double Dragon 50-Pack 12x16 Self-Seal Grey Poly Mailer Bags |Self-Seal Shipping Envelopes | Strong Waterproof Tamper-Proof Polythene Packaging for Clothes Bedding & Parcels (Also for Storage)
Double Dragon£5.264.2★5,390 rev
delka Mailing Bags Durable Pink Poly Mailer Bags Tear-Resistant Shipping Envelopes for Clothing Documents Strong Self-Seal Adhesive Waterproof & Lightweight (12x16 25PK)
delka£4.514.6★556 rev
Newest
by launch date
iSOUL Poly Mailer Bags 12x16 Self-Seal Shipping Envelopes Strong Waterproof Tamper-Proof Polythene Packaging for Clothes Bedding & Parcel Bag Shipping Post Bag Envelopes 50 Pack Pink
iSOUL£5.1380 rev
iSOUL Poly Mailer Bags 12x16 Self-Seal Shipping Envelopes Strong Waterproof Tamper-Proof Polythene Packaging for Clothes Bedding & Parcel Bag Shipping Post Bag Envelopes 50 Pack Grey
iSOUL£4.3580 rev
iSOUL Poly Mailer Bags 12x16 Self-Seal Shipping Envelopes Strong Waterproof Tamper-Proof Polythene Packaging for Clothes Bedding & Parcel Bag Shipping Post Bag Envelopes 50 Pack Hot Pink
iSOUL£5.0280 rev
Switory Parcel Bags Mailing 12X16 Inch Postal Bags Self Seal Waterproof Shipping Mailers Mailing Bag for Clothes Envelopes Postage Bag for Packaging 100Pcs (Grey)
Switory£6.76149 rev
Switory Parcel Bags Mailing 12X16 Inch Postal Bags Self Seal Waterproof Shipping Mailers Mailing Bag for Clothes Envelopes Postage Bag for Packaging 50Pcs (Grey)
Switory£4.93149 rev
Trending
90-day click momentumiSOUL Poly Mailer Bags 12x16 Self-Seal Shipping Envelopes Strong Waterproof Tamper-Proof Polythene Packaging for Clothes Bedding & Parcel Bag Shipping Post Bag Envelopes 50 Pack Hot Pink
iSOUL£5.024.7★
iSOUL Poly Mailer Bags 12x16 Self-Seal Shipping Envelopes Strong Waterproof Tamper-Proof Polythene Packaging for Clothes Bedding & Parcel Bag Shipping Post Bag Envelopes 50 Pack Pink
iSOUL£5.134.7★
iSOUL Poly Mailer Bags 12x16 Self-Seal Shipping Envelopes Strong Waterproof Tamper-Proof Polythene Packaging for Clothes Bedding & Parcel Bag Shipping Post Bag Envelopes 50 Pack Grey
iSOUL£4.354.7★
Switory Parcel Bags Mailing 12X16 Inch Postal Bags Self Seal Waterproof Shipping Mailers Mailing Bag for Clothes Envelopes Postage Bag for Packaging 100Pcs (Grey)
Switory£6.764.9★
Mailing Bags iSOUL 50 Pcs Shipping Poly Postal Self Seal Bags in Size 12 x 16 Inch Size Small Mailing Bags Postage Packaging Bags 305mm to 407mm
iSOUL£4.834.7★
What buyers say about mailing bags 12x16
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent quality”
“Good size bag”
“The material that they are made of feels strong”
“Good Value”
“everything is true to the product description”
“Easy to Use”
“The adhesive is extremely strong”
“With the sealing making things easy thickness perfect for carriage Thank you”
“strong quality material”
“Great colour”
What buyers complain about
“the product quality has deteriorated massively in the latest lot Ive ordered”
“Not fit for size”
“not as thick as others”
“Not pink”
“I mean they really stink really badly”
“Not strong”
“Too thin”
“No sticky adhesive”
“Cheaper material”
“Not exactly what it says on number”
Top return reasons
Common questions
- Is mailing bags 12x16 profitable to sell on Amazon United Kingdom?
- The niche generates £62K/yr across 22 tracked products. 4 of 5 products launched in the last 360 days are still selling. 90-day search growth is +2.2%. Flapen's verdict: Skip it (39/100).
- How competitive is the mailing bags 12x16 niche?
- 10 brands and 16 sellers compete. The top 5 products take 63% of clicks and top 5 brands hold 88% of demand.
- What do buyers complain about in mailing bags 12x16?
- Top complaints mined from reviews: Quality-Overall, Size-Overall, Thickness. The return rate is 0.1%.
- When does demand for mailing bags 12x16 peak?
- Demand peaks in Oct–Nov; the busiest month runs 2.2× the quietest.
- What does it cost to enter the mailing bags 12x16 niche?
- Listings span £2.67–£8.18; the average listing price is £5.21 (sweet spot $15–$100). The average incumbent carries 3,815 reviews — the moat a new listing must climb.