13x21 pillow insert
Skip itA small market ($42K/yr) — this niche doesn't clear our bar today.
Conversion
Great11.9%search→purchase rate — share of searches ending in a sale
Avg price
Great$22.00avg listing price — sweet spot $15–$100
Price range
Great$9.62–$33.31cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Good+22.7%90-day search growth — must beat 0% to launch
Returns
Good3.0%return rate — above 5% kills the launch gate
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Competition
Bad77%top-5 click share — a locked-up shelf
Brand share
Bad93%top-5 brand share — brand-locked demand
Review moat
Bad27,688.92avg incumbent reviews — the moat a new listing must climb
Market size
Bad$42K$42K/yr · 16K searches
According to Flapen's Amazon United States niche tracking, 13x21 pillow insert is a $42K/yr Amazon United States market (16K searches/yr). The top 5 brands hold 93% of demand. Verdict: Skip it — 41/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
13x21 pillow insert market data
- Units sold / yr
- 3K–3K
- avg 250–500/product
- Revenue / yr
- $55K–$66K
- units × avg price
- Conversion rate
- 11.9%
- Avg BSR
- #64
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 83%
- Out of stock
- 0.0%
- Avg brand age
- 44 months
- Avg seller age
- 198 days
Competition & brand share
The top 5 products capture 77% of clicks — a locked-up shelf that new listings rarely crack.Brands
7 rising
Sellers
9
Top-5 brand share
93%
Top 20: 100%
Top-5 click share
77%
Top 20: 100%
Open market
3%
- MoonRest44%
- MIULEE29%
- Pillowflex10%
- Utopia Bedding5%
- CLOUDOTE4%
- puredown4%
- Open — no brand owns it (1 brand, 3%)
Demand
Weekly Amazon search volume, last 47 weeks — +22.7% search growth over the last 90 days.Top 13x21 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 12 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
MoonRest 13x21 Inch Synthetic Down Alternative Rectangle Pillow Insert Form Stuffer for Sofa Shams Decorative Throw Pillow Cushion and Bed Pillow Stuffing - Hypoallergenic 13X 21
MoonRest$18.844.3★270 rev
MIULEE 12x20 Pillow Insert Throw Pillow for Couch Sofa Bed
MIULEE$9.764.5★38,998 rev
Pillowflex Premium Polyester Pillow Insert - 13x21 Soft Decorative Pillow
Pillowflex$31.994.5★195 rev
MIULEE Pillow Insert 13x21 Inch Decorative Rectangle Throw Pillow Inserts
MIULEE$17.014.5★6,374 rev
MoonRest Synthetic Down Alternative 13x21 Lumbar Pillow Insert Form for Decorative Throw Pillow Sofa Cushions Body and Bed - Pack of 2- Size 13 x 21
MoonRest$33.314.5★1,630 rev
Newest
by launch dateMIULEE Pillow Insert 13x21 Inch Decorative Rectangle Throw Pillow Inserts
MIULEE$17.016,374 rev
MIULEE 13x21 Inch Throw Pillow Insert for Couch Sofa Bed
MIULEE$20.0638,998 rev
CLOUDOTE Down Alternative Throw Pillow Insert (13x21 Pack of 2) Decorative Pillow for Sofa Couch Bed Chair Cushion
CLOUDOTE$30.95169 rev
CLOUDOTE Down Alternative Throw Pillow Insert (13x21 Pack of 1) Decorative Pillow for Sofa Couch Bed Chair Cushion
CLOUDOTE$15.92169 rev
Oubonun 14 x 22 Pillow Inserts (Set of 2) - Lumbar Pillow with 100% Cotton Cover - Rectangle Square Interior Sofa Pillow Inserts - Decorative Pillow Insert Pair - White Couch Pillow
Oubonun$26.6216,996 rev
Trending
90-day click momentumCLOUDOTE Down Alternative Throw Pillow Insert (13x21 Pack of 1) Decorative Pillow for Sofa Couch Bed Chair Cushion
CLOUDOTE$15.924.6★
MIULEE Pillow Insert 12x20 Inch Decorative Rectangle Throw Pillow Insert Premium Fluffy Pillow Forms Stuffer for Sofa Couch Living Room
MIULEE$9.624.5★
MoonRest Synthetic Down Alternative 13x21 Lumbar Pillow Insert Form for Decorative Throw Pillow Sofa Cushions Body and Bed - Pack of 2- Size 13 x 21
MoonRest$33.314.5★
CLOUDOTE Down Alternative Throw Pillow Insert (13x21 Pack of 2) Decorative Pillow for Sofa Couch Bed Chair Cushion
CLOUDOTE$30.954.6★
MIULEE 13x21 Inch Throw Pillow Insert for Couch Sofa Bed
MIULEE$20.064.5★
What buyers say about 13x21 pillow insert
What buyers praise and complain about, mined from review topics.What buyers love
“It fits”
“They are reliable”
“Fluffy”
“provides a great amount of support for the bed”
“This pillow was affordable”
“as listed”
“Very soft”
“Very comfortable”
“Very durable”
“it is covered by a bright white colored fabric”
What buyers complain about
“its just low quality and flat”
“The one its supposed to fit is not fitting”
“NOT worth the price”
“even thicker than both of the pillows together”
“not fluffy”
“Not a good decorative pillow”
“A little too soft”
“flimsy & does NOT hold is shape”
“Not for lying on”
“Cheap feeling material too”
Top return reasons
Common questions
- Is 13x21 pillow insert profitable to sell on Amazon United States?
- The niche generates $42K/yr across 12 tracked products. 90-day search growth is +22.7%. Flapen's verdict: Skip it (41/100).
- How competitive is the 13x21 pillow insert niche?
- 7 brands and 9 sellers compete. The top 5 products take 77% of clicks and top 5 brands hold 93% of demand.
- What do buyers complain about in 13x21 pillow insert?
- Top complaints mined from reviews: Quality-Overall, Size-Overall, Value For Money. The return rate is 3.0%.
- What does it cost to enter the 13x21 pillow insert niche?
- Listings span $9.62–$33.31; the average listing price is $22.00 (sweet spot $15–$100). The average incumbent carries 27,689 reviews — the moat a new listing must climb.