---
title: "medela flange 21mm — Niche Verdict: Skip it (33/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/baby-products/medela-flange-21mm"
last_updated: "2026-07-14T02:11:34.417Z"
locale: en
meta:
  description: "brand-locked demand (top 5 brands take 100% of clicks) — medela flange 21mm doesn't clear our bar today."
  "og:description": "brand-locked demand (top 5 brands take 100% of clicks) — medela flange 21mm doesn't clear our bar today."
  "og:title": "medela flange 21mm — Niche Verdict: Skip it (33/100) | Amazon United States - Flapen"
---

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# **medela flange 21mm**

**Skip it**

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

Market size 12Growth 22Conversion 98Competition 6Returns 32Price range 75Avg price 76Brand share 0Review moat 23Quality gap 53

**Conversion**

**Incredible****16.0%**

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

**Avg price**

**Great****$15.22**

avg listing price — sweet spot $15–$100

**Price range**

**Great****$12.04–$24.08**

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

**Quality gap**

**Good****4.4★**

avg incumbent rating — lower means beatable quality

**Returns**

**Okay****5.1%**

return rate — above 6% kills the launch gate

**Review moat**

**Bad****7,020**

avg 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**

**Bad****93%**

top-5 click share — a locked-up shelf

**Brand share**

**Bad****100%**

top-5 brand share — brand-locked demand

## **Competition**

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%**

**Open market**

**0%**

- Medela61% - PUMPMOM-US28% - MOOMentaneous6% - NENESUPPLY4% - Open — no brand owns it (0%)

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%15%$7K30%$15K45%$22K60%$30K1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

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

All 7 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Medela PersonalFit Flex Breast Shields | 2 Pack of Small 21mm Breast Pump Flanges | Made Without BPA | Shaped Around You for Comfortable and Efficient Pumping](https://m.media-amazon.com/images/I/31B0PCLXaHL.jpg)**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**$15.64**4.6★19,737 rev](https://www.amazon.com/dp/B07L197S97) [2![PumpMom-us 21mm Breast Shields Compatible with Medela Breast Pump Parts Replace Flange Accessories for PersonalFit Freestyle Harmony PersonalFit Flex Breast Shield](https://m.media-amazon.com/images/I/31qhyyKU4+L.jpg)**PumpMom-us 21mm Breast Shields Compatible with Medela Breast Pump Parts Replace Flange Accessories for PersonalFit Freestyle Harmony PersonalFit Flex Breast Shield**PUMPMOM-US**$13.44**4.5★440 rev](https://www.amazon.com/dp/B0F7LHQ5ZC) [3![Medela PersonalFit Breast Shields 2 Pack of Small 21mm Breast Pump Flanges Authentic Medela Spare Parts Made Without BPA](https://m.media-amazon.com/images/I/31FGpL0CjdL.jpg)**Medela PersonalFit Breast Shields 2 Pack of Small 21mm Breast Pump Flanges Authentic Medela Spare Parts Made Without BPA**Medela**$13.88**4.4★1,957 rev](https://www.amazon.com/dp/B000RZYJDC) [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](https://m.media-amazon.com/images/I/31+wwEv2EJL.jpg)**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**$12.04**4.4★724 rev](https://www.amazon.com/dp/B0BQRL4Z6K) [5![MOOMentaneous Breast Pump Shields Flanges 21mm Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector](https://m.media-amazon.com/images/I/31tpFEpcqIL.jpg)**MOOMentaneous Breast Pump Shields Flanges 21mm Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector**MOOMentaneous**$12.60**4.2★207 rev](https://www.amazon.com/dp/B0DJ2S2BSV)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![MOOMentaneous Breast Pump Shields Flanges 21mm Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector](https://m.media-amazon.com/images/I/31tpFEpcqIL.jpg)**MOOMentaneous Breast Pump Shields Flanges 21mm Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector**MOOMentaneous**$12.60**207 rev1y ago](https://www.amazon.com/dp/B0DJ2S2BSV) [![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](https://m.media-amazon.com/images/I/41fGoAI6dzL.jpg)**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**$14.85**4,444 rev3y ago](https://www.amazon.com/dp/B0CXCX7X8R) [![PumpMom-us 21mm Breast Shields Compatible with Medela Breast Pump Parts Replace Flange Accessories for PersonalFit Freestyle Harmony PersonalFit Flex Breast Shield](https://m.media-amazon.com/images/I/31qhyyKU4+L.jpg)**PumpMom-us 21mm Breast Shields Compatible with Medela Breast Pump Parts Replace Flange Accessories for PersonalFit Freestyle Harmony PersonalFit Flex Breast Shield**PUMPMOM-US**$13.44**440 rev3y ago](https://www.amazon.com/dp/B0F7LHQ5ZC) [![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](https://m.media-amazon.com/images/I/31+wwEv2EJL.jpg)**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**$12.04**724 rev3y ago](https://www.amazon.com/dp/B0BQRL4Z6K) [![Medela Harmony Manual Breast Pump Compact Swiss Design with PersonalFit Flex Shields and Medelas 2-Phase Expression Technology](https://m.media-amazon.com/images/I/31Srpd-3KaL.jpg)**Medela Harmony Manual Breast Pump Compact Swiss Design with PersonalFit Flex Shields and Medelas 2-Phase Expression Technology**Medela**$24.08**21,631 rev5y ago](https://www.amazon.com/dp/B08H9QJVNZ)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![PumpMom-us 21mm Breast Shields Compatible with Medela Breast Pump Parts Replace Flange Accessories for PersonalFit Freestyle Harmony PersonalFit Flex Breast Shield](https://m.media-amazon.com/images/I/31qhyyKU4+L.jpg)**PumpMom-us 21mm Breast Shields Compatible with Medela Breast Pump Parts Replace Flange Accessories for PersonalFit Freestyle Harmony PersonalFit Flex Breast Shield**PUMPMOM-US**$13.44**4.5★**▲ 92%**](https://www.amazon.com/dp/B0F7LHQ5ZC) [![MOOMentaneous Breast Pump Shields Flanges 21mm Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector](https://m.media-amazon.com/images/I/31tpFEpcqIL.jpg)**MOOMentaneous Breast Pump Shields Flanges 21mm Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector**MOOMentaneous**$12.60**4.2★**▲ 79%**](https://www.amazon.com/dp/B0DJ2S2BSV) [![Medela Harmony Manual Breast Pump Compact Swiss Design with PersonalFit Flex Shields and Medelas 2-Phase Expression Technology](https://m.media-amazon.com/images/I/31Srpd-3KaL.jpg)**Medela Harmony Manual Breast Pump Compact Swiss Design with PersonalFit Flex Shields and Medelas 2-Phase Expression Technology**Medela**$24.08**4.5★**▲ 32%**](https://www.amazon.com/dp/B08H9QJVNZ) [![Medela PersonalFit Breast Shields 2 Pack of Small 21mm Breast Pump Flanges Authentic Medela Spare Parts Made Without BPA](https://m.media-amazon.com/images/I/31FGpL0CjdL.jpg)**Medela PersonalFit Breast Shields 2 Pack of Small 21mm Breast Pump Flanges Authentic Medela Spare Parts Made Without BPA**Medela**$13.88**4.4★**▲ 25%**](https://www.amazon.com/dp/B000RZYJDC) [![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](https://m.media-amazon.com/images/I/31+wwEv2EJL.jpg)**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**$12.04**4.4★**▼ 13%**](https://www.amazon.com/dp/B0BQRL4Z6K)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 102 weeks — -5.1% search growth over the last 90 days.

700500Spike '25 seasonDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.3×

## **Reviews**

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

### **What buyers love **

**Ease Of Use**25%

*“Easy to use”*

**Ease Of Cleaning**12%

*“Easy to clean”*

**Breastfeeding Friendly**8%

*“First time breast feeding made easy”*

**Portability**8%

*“Portable”*

**Value For Money**8%

*“Worth it”*

**Quality-Overall**6%

*“Definitely reliable and worth it to buy”*

**Comfort-Overall**4%

*“Comfortable”*

**Ease Of Feeding**4%

*“it actually removes all the milk when I take my time with it”*

**Size-Overall**3%

*“Fit well”*

**Durability**2%

*“Durable”*

### **What buyers complain about **

**Functionality-Overall**24%

*“Didnt work”*

**Durability**15%

*“Broke quickly”*

**Ease Of Use**6%

*“which can be frustrating”*

**Quality-Overall**5%

*“Quality cheaper than it is used to be”*

**Value For Money**5%

*“Not worth the money”*

**Ease Of Cleaning**5%

*“Difficult to clean”*

**Natural Resource Wastage**3%

*“Waste”*

**Handle Quality**2%

*“Handle Breaks”*

**Breastfeeding Friendly**2%

*“I was not really able to breastfeed or pump”*

**Instructions/User Manual/Troubleshooting**2%

*“I spend more time trying to get it to work”*

### **Top return reasons **

**Functionality-Overall**29%

**Size-Overall**28%

**Defective Material/Parts**9%

**Advertised Vs Actual Product**6%

**Breastfeeding Friendly**4%

**Handle Quality**4%

**Value For Money**3%

**Comfort-Overall**2%

**Product Condition**2%

**Leak-Proof**2%