21st birthday sash
Skip itPrices mostly outside the sweet spot ($5.74–$12.79) — this niche doesn't clear our bar today.
Review moat
Good720.31avg incumbent reviews — the moat a new listing must climb
Returns
Good2.5%return rate — above 5% kills the launch gate
Conversion
Good4.5%search→purchase rate — share of searches ending in a sale
Market size
Okay$239K$239K/yr · 601K searches
Brand share
Okay84%top-5 brand share — brands hold most of the demand
Avg price
Okay$8.90avg listing price — sweet spot $15–$100
Growth
Bad-1.3%90-day search growth — must beat 0% to launch
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Competition
Bad76%top-5 click share — a locked-up shelf
Price range
Bad$5.74–$12.79cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, 21st birthday sash is a $239K/yr Amazon United States market (601K searches/yr). The top 5 brands hold 84% of demand. Verdict: Skip it — 36/100.
Data updated Jul 13, 2026 · scored weekly · How we score niches
21st birthday sash market data
- Units sold / yr
- 30K–40K
- avg 1,000–1,250/product
- Revenue / yr
- $267K–$356K
- units × avg price
- Conversion rate
- 4.5%
- Avg BSR
- #847
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 85%
- Out of stock
- 2.4%
- Avg brand age
- 26 months
- Avg seller age
- 179 days
Competition & brand share
The top 5 products capture 76% of clicks — a locked-up shelf that new listings rarely crack.Brands
10 falling
Sellers
12
Top-5 brand share
84%
Top 20: 100%
Top-5 click share
76%
Top 20: 100%
Open market
12%
- KICOSY41%
- Araluky22%
- PartyForever8%
- Docooniver7%
- Juesly6%
- Semato4%
- Open — no brand owns it (4 brands, 12%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -1.3% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.6×
Top 21st birthday sash search terms
- 21st birthday sash337K/yr
- 21st birthday crown45K/yr
- 21st birthday sash and crown33K/yr
- 21 sash22K/yr
- 21st birthday tiara23K/yr
- finally 21 birthday sash17K/yr
- birthday sash 2114K/yr
- 21 birthday sash14K/yr
- 21st birthday crown and sash12K/yr
- 21st birthday sash for women13K/yr
Top 21st birthday sash 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 13 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
21st Birthday Crowns and Sash for Women Birthday Sash Princess Tiara Headband Rose Gold Crown with Combs Crystal Tiaras Headpieces for Party Hair Accessories Gifts
KICOSY$8.484.6★200 rev
Araluky Happy 21st Birthday Decorations for Her with Happy 21st Birthday Sash for Women & Twenty-one Crown 21 years old Gifts
Araluky$12.794.6★111 rev
Docooniver 21st Birthday Sash for Girls and Women Finally 21 Sash White with Gold Foil Lettering
Docooniver$5.994.7★1,460 rev
KICOSY 21st Birthday Crowns and Sash for Women Princess Tiara Sash Set Elegant Sliver Crown with Combs for Girls 21st Birthday Decorations for Her Party Hair Accessories Gifts
KICOSY$10.004.7★93 rev
PartyForever 21st Birthday Decoration Sash for Women Im 21! Black 33.5 inch Long with Rose Gold Letters for Her
PartyForever$8.064.7★356 rev
Newest
by launch date
21st Birthday Decorations for Her with 21st Birthday Sash and Crown Candles Gold Gifts for 21 Year Old Girls
Juesly$9.931,096 rev
21st Birthday Decorations for Her with 21st Birthday Sash White and Tiara Gold 21 Candles Gold 21 Year Old Gifts for Her
Juesly$9.811,096 rev
Semato 21st Birthday Decorations for Her Sash and Crown Tiara Kit Rose Gold 21st Birthday Gifts for Girls Party Supplies
Semato$11.81239 rev
Vuzvuv Finally 21 Birthday Sash with Glitter 21st Birthday Decoration 21st Sash for Women Man Twenty One Party Favors Supplies and Decor-Black
Vuzvuv$5.7486 rev
Luwigs Finally 21 Birthday Sash with Glitter Gold Sash with Black Foil 21st Birthday Decoration Sash for Men and Women Bday Party Favors Supplies (Gold)
Luwigs$6.9917 rev
Trending
90-day click momentumAraluky Happy 21st Birthday Decorations for Her with Happy 21st Birthday Sash for Women & Twenty-one Crown 21 years old Gifts
Araluky$12.794.6★
Docooniver 21st Birthday Sash for Girls and Women Finally 21 Sash White with Gold Foil Lettering
Docooniver$5.994.7★
21st Birthday Crowns and Sash for Women Birthday Sash Princess Tiara Headband Rose Gold Crown with Combs Crystal Tiaras Headpieces for Party Hair Accessories Gifts
KICOSY$8.484.6★
Luwigs Finally 21 Birthday Sash with Glitter Gold Sash with Black Foil 21st Birthday Decoration Sash for Men and Women Bday Party Favors Supplies (Gold)
Luwigs$6.994.4★
21st Birthday Decorations for Her Include 21st Birthday Sash and Tiara Cake Topper and Candles Number Balloons 21 Year Old Gifts for Her
YeohJoy$10.064.7★
What buyers say about 21st birthday sash
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent Product”
“Good color, daughter wore this for her 21st birthday”
“Great Value”
“Durable”
“As described”
“comfortable”
“The sash fits comfortably”
“Very cute and easy”
“nicely designed”
“A perfect gift”
What buyers complain about
“This was a tad cheaper quality than expected”
“Small”
“looks more expensive than it is”
“if you have a bigger head it might hurt because it doesn't stretch well”
“the tiara is heavier than i thought”
Top return reasons
Common questions
- Is 21st birthday sash profitable to sell on Amazon United States?
- The niche generates $239K/yr across 13 tracked products. 90-day search growth is -1.3%. Flapen's verdict: Skip it (36/100).
- How competitive is the 21st birthday sash niche?
- 10 brands and 12 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 84% of demand.
- What do buyers complain about in 21st birthday sash?
- Top complaints mined from reviews: Quality-Overall, Size-Overall, Value For Money. The return rate is 2.5%.
- When does demand for 21st birthday sash peak?
- Demand is steady year-round — the busiest month runs 1.6× the quietest.
- What does it cost to enter the 21st birthday sash niche?
- Listings span $5.74–$12.79; the average listing price is $8.90 (sweet spot $15–$100). The average incumbent carries 720 reviews — the moat a new listing must climb.