---
title: "Extra Large Postage Bags — £141K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/business-industry-science/extra-large-postage-bags"
last_updated: "2026-07-31T17:32:57.148Z"
locale: en
meta:
description: "Niche score 42/100 · £141K/yr market · 193K searches/yr · £5.29 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 42/100 · £141K/yr market · 193K searches/yr · £5.29 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Extra Large Postage Bags — £141K/yr Amazon UK Niche (2026) - Flapen"
---
# **extra large postage bags**
**Skip it**
Prices mostly outside the sweet spot ($2.59–$11.06) — this niche doesn't clear our bar today.
Market size 31Growth 13Conversion 96Competition 48Returns 99Price range 0Avg price 15Brand share 40Review moat 25Quality gap 25
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****13.7%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Okay****56%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****81%**
top-5 brand share — brands hold most of the demand
**Market size**
**Okay****£141K**
£141K/yr · 193K searches
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****4,284.69**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Bad****£5.29**
avg listing price — sweet spot $15–$100
**Growth**
**Bad****-23.2%**
90-day search growth — must beat 0% to launch
**Price range**
**Bad****£2.59–£11.06**
cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, extra large postage bags is a £141K/yr Amazon United Kingdom market (193K searches/yr). The top 5 brands hold 81% of demand. Verdict: Skip it — 42/100.
Data updated Jul 21, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **extra large postage bags market data**
- **Units sold / yr**
- **25K–30K**
- avg 750–1,000/product
- **Revenue / yr**
- **£132K–£159K**
- units × avg price
- **Conversion rate**
- **13.7%**
- **Avg BSR**
- **#12**
- **Page quality**
- **0%**
- **Prime**
- **88%**
- **Sponsored**
- **88%**
- **Out of stock**
- **5.6%**
- **Avg brand age**
- **41 months**
- **Avg seller age**
- **174 days**
## **Competition & brand share**
The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▼falling
**Sellers**
**21**
**Top-5 brand share**
**81%**
Top 20: 100%
**Top-5 click share**
**56%**
Top 20: 94%
**Open market**
**12%**
- iSOUL21% - Double Dragon18% - JeeJaan18% - Paxfords13% - Calzette11% - G4GADGET7% - Open — no brand owns it (7 brands, 12%)
## **Demand**
Weekly Amazon search volume, last 45 weeks — -23.2% search growth over the last 90 days.
4K3KSpike '26Sep '25Oct '25Dec '25Feb '26Mar '26May '26
[**Open Trend **](https://flapen.com/research/uk/business-industry-science/extra-large-postage-bags/trend)
## **Top extra large postage bags search terms**
- **extra large postage bags**33K/yr-44.9%15.5% conv. - **large shipping bags**21K/yr-20.7%11.1% conv. - **large packing bags**13K/yr+35.4%6.7% conv. - **extra large parcel bags**18K/yr-23.5%14.8% conv. - **extra large mailing bags**17K/yr-19.8%10.5% conv. - **mailing bags large 17x24**7K/yr+7.1%10.8% conv. - **17x24 mailing bags**11K/yr-18.3%11.1% conv. - **xl postage bags**13K/yr-42.4%13.4% conv. - **17 x 24 mailing bags**9K/yr-0.9%11.2% conv. - **xl parcel bags**9K/yr-17.5%12.3% conv. [**All search terms **](https://flapen.com/research/uk/business-industry-science/extra-large-postage-bags/search-terms)
## **Top extra large postage bags 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.
0%5%£7K10%£14K15%£21K20%£28K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1![25 x Strong Large Grey Mailing Postal Postage Bags 17 x 24 Packaging Mailers [Use in Parcel Delivery Shipping Mail Package] [432mm x 610mm]](https://m.media-amazon.com/images/I/31LX25wEzIS.jpg)**25 x Strong Large Grey Mailing Postal Postage Bags 17 x 24 Packaging Mailers \[Use in Parcel Delivery Shipping Mail Package\] \[432mm x 610mm\]**iSOUL**£5.02**4.7★8,846 rev](https://www.amazon.co.uk/dp/B08MFMSKJF) [2**Paxfords Large Postage Bags for Clothes 17x24- Extra Strong Packing Bags for Posting - Strong Self-Seal Packaging Postal Bags - Grey Recyclable Mailing and Shipping Mailers (5)**Paxfords**£4.74**4.7★309 rev](https://www.amazon.co.uk/dp/B0FW4SXMS3) [3**5 Extra Large Postage Bags 24x36 Calzette Strong Mailing Bags for Parcels**Calzette**£5.13**4.6★6,127 rev](https://www.amazon.co.uk/dp/B07KX1XKN5) [4**JeeJaan 5 Pcs of Large Grey Postage Bags 24 x 36 - 610 x 914 mm Grey Parcel Bags Extra Strong Polythene Mail Envelopes for Packaging Parcel Self Seal Poly Mailer Ideal for Shipping Purpose**JeeJaan**£4.25**4.7★3,469 rev](https://www.amazon.co.uk/dp/B08JSH69C8) [5**Double Dragon 10-Pack Extra-Large 24x36 Grey Poly Mailer Bags | Self-Seal Shipping Envelopes | Strong Waterproof Tamper-Proof Polythene Packaging for Clothes Bedding & Parcels (Also for Storage)**Double Dragon**£4.83**4.2★5,390 rev](https://www.amazon.co.uk/dp/B0DNWM1C97)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Large Postage Bags for Clothes Vinted - 25 Packs 17x24 Inch Mailing Bags Self Seal Waterproof Parcel Bag - Heavy Duty Grey Poly Mailers for Packaging Shipping & Delivery - (432 x 610 mm)**LIVERPOOL ENTERPRISES LTD**£5.96**676 rev3mo ago](https://www.amazon.co.uk/dp/B0GWHMXXWP) [![25 x Strong Large Baby Pink Mailing Postal Postage Bags 17 x 24 Packaging Mailers [Use in Parcel Delivery Shipping Mail Package] [432mm x 610mm] Pink](https://m.media-amazon.com/images/I/3180zBqKJYL.jpg)**25 x Strong Large Baby Pink Mailing Postal Postage Bags 17 x 24 Packaging Mailers \[Use in Parcel Delivery Shipping Mail Package\] \[432mm x 610mm\] Pink**iSOUL**£5.87**73 rev4mo ago](https://www.amazon.co.uk/dp/B0GRGXH3LG) [**Paxfords Large Postage Bags for Clothes 17x24- Extra Strong Packing Bags for Posting - Strong Self-Seal Packaging Postal Bags - Grey Recyclable Mailing and Shipping Mailers (5)**Paxfords**£4.74**309 rev9mo ago](https://www.amazon.co.uk/dp/B0FW4SXMS3) [**Switory Parcel Bags Mailing 17x24 Inch Postal Bags Self Seal Waterproof Shipping Mailers Mailing Bag for Clothes Envelopes Postage Bag for Packaging 50Pcs (Grey)**Switory**£7.90**149 rev1y ago](https://www.amazon.co.uk/dp/B0FCF7S2NF) [**Switory Large Parcel Bags 17x24 Inch Large Postage Bags Self Seal Waterproof Shipping Mailers Mailing Bags for Clothes Envelopes Postal Bags for Packaging 25Pcs (Grey)**Switory**£5.59**149 rev1y ago](https://www.amazon.co.uk/dp/B0FCF6PZL4)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Large Postage Bags for Clothes Vinted - 25 Packs 17x24 Inch Mailing Bags Self Seal Waterproof Parcel Bag - Heavy Duty Grey Poly Mailers for Packaging Shipping & Delivery - (432 x 610 mm)**LIVERPOOL ENTERPRISES LTD**£5.96**4.6★**▲ 336%**](https://www.amazon.co.uk/dp/B0GWHMXXWP) [![25 x Strong Large Baby Pink Mailing Postal Postage Bags 17 x 24 Packaging Mailers [Use in Parcel Delivery Shipping Mail Package] [432mm x 610mm] Pink](https://m.media-amazon.com/images/I/3180zBqKJYL.jpg)**25 x Strong Large Baby Pink Mailing Postal Postage Bags 17 x 24 Packaging Mailers \[Use in Parcel Delivery Shipping Mail Package\] \[432mm x 610mm\] Pink**iSOUL**£5.87**4.4★**▲ 292%**](https://www.amazon.co.uk/dp/B0GRGXH3LG) [**Large Postage Bags 17x24 for Clothes - Extra Strong Packing Bags for Posting - Strong Self-Seal Packaging Postal Bags - Grey Recyclable Mailing and Shipping Mailers (5)**JeeJaan**£3.84**4.7★**▲ 276%**](https://www.amazon.co.uk/dp/B08JTM386M) [**Switory Parcel Bags Mailing 17x24 Inch Postal Bags Self Seal Waterproof Shipping Mailers Mailing Bag for Clothes Envelopes Postage Bag for Packaging 50Pcs (Grey)**Switory**£7.90**4.9★**▲ 198%**](https://www.amazon.co.uk/dp/B0FCF7S2NF) [**REQUISITE NEEDS 5 PACK Strong Extra large Jumbo Storage Laundry zipped bag Reusable (80 x 60 x 28 CM)**REQUISITE NEEDS**£8.16**4.1★**▲ 137%**](https://www.amazon.co.uk/dp/B09SJ23JFD)
**~~View all trending →~~**
## **What buyers say about extra large postage bags**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**22%
*“Good size bag”*
**Quality-Overall**19%
*“These bags are really good quality”*
**Value For Money**15%
*“Good price”*
**Strength**13%
*“Great strong bags”*
**Advertised Vs Actual Product**6%
*“As advertised”*
**Durability**3%
*“They are durable”*
**Thickness**3%
*“Good thickness”*
**Ease Of Use**3%
*“Easy to use”*
**Adhesion/Stickiness**2%
*“Strong adhesive”*
**Storage Capacity**1%
*“Biggest size has a large capacity”*
### **What buyers complain about **
**Quality-Overall**29%
*“Cheap quality”*
**Thickness**16%
*“Not the thickest bags”*
**Size-Overall**10%
*“Too small”*
**Adhesion/Stickiness**10%
*“The self stick adesive is very poor”*
**Strength**6%
*“Not strong”*
**Material Quality**3%
*“Very cheap material”*
**Durability**3%
*“They broke very easily”*
**Smell**3%
*“very strong smell”*
**Value For Money**3%
*“overpriced”*
**Advertised Vs Actual Product**1%
*“Not as advertised”*
### **Top return reasons **
**Size-Overall**56%
**Quality-Overall**14%
**Thin**8%
**Strength**4%
**Smell**3%
**Value For Money**2%
**Advertised Vs Actual Product**2%
**Functionality-Overall**2%
**Defective Material/Parts**2%
**Material Quality**1%
## **Common questions**
- **Is extra large postage bags profitable to sell on Amazon United Kingdom?**
- The niche generates £141K/yr across 26 tracked products. 2 of 4 products launched in the last 360 days are still selling. 90-day search growth is -23.2%. Flapen's verdict: Skip it (42/100).
- **How competitive is the extra large postage bags niche?**
- 13 brands and 21 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 81% of demand.
- **What do buyers complain about in extra large postage bags?**
- Top complaints mined from reviews: Quality-Overall, Thickness, Size-Overall. The return rate is 0.1%.
- **What does it cost to enter the extra large postage bags niche?**
- Listings span £2.59–£11.06; the average listing price is £5.29 (sweet spot $15–$100). The average incumbent carries 4,285 reviews — the moat a new listing must climb.
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