medela flange 21mm
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Conversion
Incredible16.0%search→purchase rate — share of searches ending in a sale
Avg price
Great$15.22avg listing price — sweet spot $15–$100
Price range
Great$12.04–$24.08cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Returns
Bad5.1%return rate — above 5% kills the launch gate
Review moat
Bad7,020avg incumbent reviews — the moat a new listing must climb
Growth
Bad-5.1%90-day search growth — must beat 0% to launch
Market size
Bad$49K$49K/yr · 20K searches
Competition
Bad93%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, medela flange 21mm is a $49K/yr Amazon United States market (20K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 32/100.
Data updated Jul 12, 2026 · scored weekly · How we score niches
medela flange 21mm market data
- Units sold / yr
- 3K–4K
- avg 500–750/product
- Revenue / yr
- $46K–$61K
- units × avg price
- Conversion rate
- 16.0%
- Avg BSR
- #63
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 71%
- Out of stock
- 0.0%
- Avg brand age
- 41 months
- Avg seller age
- 146 days
Competition & brand share
The top 5 products capture 93% of clicks — a locked-up shelf that new listings rarely crack.Brands
4 falling
Sellers
16
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
93%
Top 20: 100%
Open market
0%
- Medela61%
- PUMPMOM-US28%
- MOOMentaneous6%
- NENESUPPLY4%
- Open — no brand owns it (0%)
Demand & seasonality
Weekly Amazon search volume, last 102 weeks — -5.1% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.3×
Top medela flange 21mm search terms
- medela 21mm flange8K/yr
- medela flange 21mm6K/yr
- medela flanges 21mm3K/yr
- medela hand pump 21mm flange2K/yr
- 21 mm flange medela2K/yr
Top medela flange 21mm 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 7 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Medela PersonalFit Flex Breast Shields | 2 Pack of Small 21mm Breast Pump Flanges | Made Without BPA | Shaped Around You for Comfortable and Efficient Pumping
Medela$15.644.6★19,737 rev
PumpMom-us 21mm Breast Shields Compatible with Medela Breast Pump Parts Replace Flange Accessories for PersonalFit Freestyle Harmony PersonalFit Flex Breast Shield
PUMPMOM-US$13.444.5★440 rev
Medela PersonalFit Breast Shields 2 Pack of Small 21mm Breast Pump Flanges Authentic Medela Spare Parts Made Without BPA
Medela$13.884.4★1,957 rev
PumpMom-us 21mm Soft Rim Flanges Compatible with Medela Breast Pump PersonalFit Freestyle Maxflow Freestyle Flex Swing Maxi Connectors Replace 21 Flange Accessories with Wider Opening Angle
PUMPMOM-US$12.044.4★724 rev
MOOMentaneous Breast Pump Shields Flanges 21mm Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector
MOOMentaneous$12.604.2★207 rev
Newest
by launch dateMOOMentaneous Breast Pump Shields Flanges 21mm Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector
MOOMentaneous$12.60207 rev
Nenesupply 21mm Oval Flanges Compatible with Medela Pump Parts Replacement 21mm Flange for Medela Breast Pumps. Work with Pump in Style Parts Symphony Parts Swing Maxi Harmony and Personalfit Flex
NENESUPPLY$14.854,444 rev
PumpMom-us 21mm Breast Shields Compatible with Medela Breast Pump Parts Replace Flange Accessories for PersonalFit Freestyle Harmony PersonalFit Flex Breast Shield
PUMPMOM-US$13.44440 rev
PumpMom-us 21mm Soft Rim Flanges Compatible with Medela Breast Pump PersonalFit Freestyle Maxflow Freestyle Flex Swing Maxi Connectors Replace 21 Flange Accessories with Wider Opening Angle
PUMPMOM-US$12.04724 rev
Medela Harmony Manual Breast Pump Compact Swiss Design with PersonalFit Flex Shields and Medelas 2-Phase Expression Technology
Medela$24.0821,631 rev
Trending
90-day click momentumPumpMom-us 21mm Breast Shields Compatible with Medela Breast Pump Parts Replace Flange Accessories for PersonalFit Freestyle Harmony PersonalFit Flex Breast Shield
PUMPMOM-US$13.444.5★
MOOMentaneous Breast Pump Shields Flanges 21mm Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector
MOOMentaneous$12.604.2★
Medela Harmony Manual Breast Pump Compact Swiss Design with PersonalFit Flex Shields and Medelas 2-Phase Expression Technology
Medela$24.084.5★
Medela PersonalFit Breast Shields 2 Pack of Small 21mm Breast Pump Flanges Authentic Medela Spare Parts Made Without BPA
Medela$13.884.4★
PumpMom-us 21mm Soft Rim Flanges Compatible with Medela Breast Pump PersonalFit Freestyle Maxflow Freestyle Flex Swing Maxi Connectors Replace 21 Flange Accessories with Wider Opening Angle
PUMPMOM-US$12.044.4★
What buyers say about medela flange 21mm
What buyers praise and complain about, mined from review topics.What buyers love
“Easy to use”
“Easy to clean”
“First time breast feeding made easy”
“Portable”
“Worth it”
“Definitely reliable and worth it to buy”
“Comfortable”
“it actually removes all the milk when I take my time with it”
“Fit well”
“Durable”
What buyers complain about
“Didnt work”
“Broke quickly”
“which can be frustrating”
“Quality cheaper than it is used to be”
“Not worth the money”
“Difficult to clean”
“Waste”
“Handle Breaks”
“I was not really able to breastfeed or pump”
“I spend more time trying to get it to work”
Top return reasons
Common questions
- Is medela flange 21mm profitable to sell on Amazon United States?
- The niche generates $49K/yr across 7 tracked products. 90-day search growth is -5.1%. Flapen's verdict: Skip it (32/100).
- How competitive is the medela flange 21mm niche?
- 4 brands and 16 sellers compete. The top 5 products take 93% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in medela flange 21mm?
- Top complaints mined from reviews: Functionality-Overall, Durability, Ease Of Use. The return rate is 5.1% — above our launch gate.
- When does demand for medela flange 21mm peak?
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- What does it cost to enter the medela flange 21mm niche?
- Listings span $12.04–$24.08; the average listing price is $15.22 (sweet spot $15–$100). The average incumbent carries 7,020 reviews — the moat a new listing must climb.