21x21 pillow insert
Skip itA small market ($31K/yr) — this niche doesn't clear our bar today.
Avg price
Incredible$24.86avg listing price — sweet spot $15–$100
Price range
Great$13.29–$45.96cheapest to priciest tracked listing — scored on the share inside $15–$100
Returns
Great1.7%return rate — above 5% kills the launch gate
Conversion
Good4.0%search→purchase rate — share of searches ending in a sale
Competition
Okay59%top-5 click share — leaders hold, buyers still browse
Growth
Bad-5.7%90-day search growth — must beat 0% to launch
Brand share
Bad91%top-5 brand share — brand-locked demand
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Review moat
Bad31,169.24avg incumbent reviews — the moat a new listing must climb
Market size
Bad$31K$31K/yr · 31K searches
According to Flapen's Amazon United States niche tracking, 21x21 pillow insert is a $31K/yr Amazon United States market (31K searches/yr). The top 5 brands hold 91% of demand. Demand peaks in Sep. Verdict: Skip it — 38/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
21x21 pillow insert market data
- Units sold / yr
- 2K–3K
- avg 0–100/product
- Revenue / yr
- $50K–$62K
- units × avg price
- Conversion rate
- 4.0%
- Avg BSR
- #46
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 100%
- Out of stock
- 0.0%
- Avg brand age
- 50 months
- Avg seller age
- 180 days
Competition & brand share
The top 5 products take 59% of clicks — established leaders, but buyers still shop beyond them.Brands
10 rising
Sellers
16
Top-5 brand share
91%
Top 20: 100%
Top-5 click share
59%
Top 20: 94%
Open market
6%
- MIULEE42%
- Amazon Basics19%
- Utopia Bedding13%
- Pillowflex10%
- Artscope8%
- puredown2%
- Open — no brand owns it (4 brands, 6%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -5.7% search growth over the last 90 days.Peak months: Sep · busiest ÷ quietest = 2.1×
Top 21x21 pillow insert search terms
- down alternative pillow insert16K/yr
- down alternative pillow inserts4K/yr
- 20x20 down alternative pillow insert4K/yr
- 20x20 pillow inserts down alternative3K/yr
- down alternative throw pillow3K/yr
Top 21x21 pillow insert 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
MIULEE 20x20 Pillow Inserts Fluffy Down Alternative Filling Pack of 2
MIULEE$21.924.8★301 rev
Amazon Basics Square Hypoallergenic Down Alternative Pillow Insert Machine Washable Softness and Support 20 inch 2-Pack
Amazon Basics$17.544.3★1,946 rev
MIULEE 20x20 Pillow Inserts 2 Pack Premium Down Alternative Throw Pillows
MIULEE$24.074.6★2,076 rev
Pillowflex Synthetic Down Pillow Insert 20x20 in - Karate Chop Pillow
Pillowflex$29.744.7★11,608 rev
Utopia Bedding 18x18 Pillow Inserts White Throw Pillows for Couch 2 Pack
Utopia Bedding$16.074.6★217,964 rev
Newest
by launch date
MIULEE 20x20 Pillows Inserts Pack of 2 Down Alternative Virgin Filling
MIULEE$21.55532 rev
MIULEE 18x18 Pillows Inserts Pack of 4 Down Alternative Virgin Filling
MIULEE$20.95532 rev
Ashler Home Deco Synthetic Down Pillow Inserts 20x20 Down Alternative Throw Pillows Insert Sleeping Pillows with 100% Cotton Cover Decorative Pillow Stuffer for Sofa Couch Bed(Set of 2 White)
Ashler Home Deco$25.7489 rev
Amazon Basics Square Hypoallergenic Down Alternative Pillow Insert Machine Washable Softness and Support 20 inch 2-Pack
Amazon Basics$17.541,946 rev
MIULEE 20x20 Pillow Inserts Fluffy Down Alternative Filling Pack of 2
MIULEE$21.92301 rev
Trending
90-day click momentumAmazon Basics Square Hypoallergenic Down Alternative Pillow Insert Machine Washable Softness and Support 20 inch 2-Pack
Amazon Basics$17.544.3★
MIULEE 18x18 Pillows Inserts Pack of 4 Down Alternative Virgin Filling
MIULEE$20.954.8★
MIULEE 20x20 Pillows Inserts Pack of 2 Down Alternative Virgin Filling
MIULEE$21.554.8★
MIULEE 12x20 Down Alternative Pillow Insert Decorative Throw Pillow 12 x 20 Inch Body Bed Sleeping Ultra Soft Fluffy Form for Sofa Couch Bed
MIULEE$13.294.7★
MIULEE 20x20 Pillow Inserts Fluffy Down Alternative Filling Pack of 2
MIULEE$21.924.8★
What buyers say about 21x21 pillow insert
What buyers praise and complain about, mined from review topics.What buyers love
“The quality is solid”
“Soft and Fluffy”
“Soft and fluffy”
“The cushion is not bad”
“Great fit”
“Great Buy”
“Comfy product”
“Amazing pillows”
“As advertised”
“They hold their shape”
What buyers complain about
“Not full and fluffy”
“BAD FIT”
“Cheaply made”
“It almost looks like an extra thin small child sitting in a large coat lol I dont know how else to describe them except that they are half the full fullness you think that you would need to fill the pillowcase”
“I needed some pillows and these are less firm that I wanted and kinda flat”
“Picture is deceiving”
“Price won out”
“can lose shape over time”
“beware that the quality of these feathers is poor to create such an awful smell”
“offer minimal support”
Top return reasons
Common questions
- Is 21x21 pillow insert profitable to sell on Amazon United States?
- The niche generates $31K/yr across 25 tracked products. 3 of 5 products launched in the last 360 days are still selling. 90-day search growth is -5.7%. Flapen's verdict: Skip it (38/100).
- How competitive is the 21x21 pillow insert niche?
- 10 brands and 16 sellers compete. The top 5 products take 59% of clicks and top 5 brands hold 91% of demand.
- What do buyers complain about in 21x21 pillow insert?
- Top complaints mined from reviews: Fluffiness, Size-Overall, Quality-Overall. The return rate is 1.7%.
- When does demand for 21x21 pillow insert peak?
- Demand peaks in Sep; the busiest month runs 2.1× the quietest.
- What does it cost to enter the 21x21 pillow insert niche?
- Listings span $13.29–$45.96; the average listing price is $24.86 (sweet spot $15–$100). The average incumbent carries 31,169 reviews — the moat a new listing must climb.