Is 21st birthday banner profitable to sell on Amazon United States?

The niche generates $85K/yr across 68 tracked products. 2 of 25 products launched in the last 360 days are still selling. 90-day search growth is +4.3%. Flapen's verdict: Worth a look (50/100).

How competitive is the 21st birthday banner niche?

54 brands and 64 sellers compete. The top 5 products take 30% of clicks and top 5 brands hold 39% of demand.

What do buyers complain about in 21st birthday banner?

Top complaints mined from reviews: Assembly/Installation, Value For Money, Material Quality. The return rate is 3.4%.

When does demand for 21st birthday banner peak?

Demand is steady year-round — the busiest month runs 1.8× the quietest.

What does it cost to enter the 21st birthday banner niche?

Listings span $4.93–$20.44; the average listing price is $10.22 (sweet spot $15–$100). The average incumbent carries 688 reviews — the moat a new listing must climb.

21st birthday banner

Worth a look

Shows no brand lock-in (top 5 brands take 39% of clicks), but a small market ($85K/yr) keeps it on the watch list.

Brand share

Incredible39%

top-5 brand share — no brand owns this niche

Competition

Great30%

top-5 click share — an open shelf

Review moat

Good688.22

avg incumbent reviews — the moat a new listing must climb

Conversion

Good5.4%

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

Returns

Okay3.4%

return rate — above 5% kills the launch gate

Avg price

Okay$10.22

avg listing price — sweet spot $15–$100

Price range

Okay$4.93–$20.44

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

Growth

Okay+4.3%

90-day search growth — must beat 0% to launch

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Market size

Bad$85K

$85K/yr · 153K searches

Signals No Dominant Brand Low Review Barrier

According to Flapen's Amazon United States niche tracking, 21st birthday banner is a $85K/yr Amazon United States market (153K searches/yr). The top 5 brands hold 39% of demand. Verdict: Worth a look — 50/100.

Data updated Jul 22, 2026 · scored weekly · How we score niches

21st birthday banner market data

Units sold / yr: 6K–8K; avg 0–100/product
Revenue / yr: $61K–$82K; units × avg price
Conversion rate: 5.4%
Avg BSR: #2,580
Page quality: 0%
Prime: 100%
Sponsored: 84%
Out of stock: 3.9%
Avg brand age: 24 months
Avg seller age: 211 days

Competition & brand share

Clicks spread well past the top 5 (30% combined) — an open shelf where new products get seen.

Brands

54 falling

Sellers

Top-5 brand share

39%

Top 20: 76%

Top-5 click share

30%

Top 20: 62%

Open market

57%

MAGLAUG11%
CNERWQEEY9%
JOTTING8%
Blulu6%
Netnology4%
JunyRuny4%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +4.3% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.8×

Open Trend

Top 21st birthday banner search terms

21st birthday banner54K/yr +3.4%3.7% conv.
happy 21st birthday banner37K/yr +7.4%4.1% conv.
21st birthday backdrop16K/yr +9.8%1.2% conv.
21st birthday banner for her11K/yr +4.1%3.8% conv.
21st birthday sign13K/yr -14.1%2.2% conv.
21st birthday banner for him9K/yr +13.7%3.8% conv.
21st birthday backdrop for her5K/yr +21.8%1.4% conv.
21 banner4K/yr -4.3%4.1% conv.
21 birthday banner3K/yr +1.7%6.0% conv.

All search terms

Top 21st birthday banner 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

21st Banner

CNERWQEEY$8.903.6★13 rev

21st Birthday Decorations Banner For Boys Girls Men Women

MAGLAUG$6.714.4★206 rev

21st Birthday Decorations Banner For Girls Women

MAGLAUG$6.564.5★64 rev

Birthday Party Decoration Extra Large Fabric Black Gold Sign Poster for Anniversary Photo Booth Backdrop Background Banner Birthday Party Supplies 72.8 x 43.3 Inch (21st)

Blulu$8.824.8★10,545 rev

21st Happy Birthday Backdrop for 21st Birthday Decorations 21st Banner for Birthday Decorations for Her

JOTTING$9.853.0★2 rev

Newest

by launch date

21st Black Bow Banner for 21st Birthday Decorations Happy 21st Backdrop for Birthday Decorations for Her

JOTTING$9.870 rev

3mo ago

21st Happy Birthday Backdrop for 21st Birthday Decorations 21st Banner for Birthday Decorations for Her

JOTTING$9.852 rev

4mo ago

JNXCYQ Black Gold Happy 21st Birthday Banner-21st Birthday Decorations for Him Her Glitter 21st Birthday Decor Sign for Boys Girls Men Women 21 Year Old Birthday Party Decorations Supplies-No DIY

JNXCYQ$8.648 rev

4mo ago

Yatufom Happy 21st Birthday Party Decorations for Girls Pre-Strung Pink Rose Gold 21st Birthday Banner with 6.5ft/2m Warm White LED Lights Funny 21 year old Bday Party Supplies Sign Favor

Yatufom$9.781 rev

5mo ago

Fulmoon Pre Strung Happy 21st Birthday Awesome Since 2005 Banner Glitter 21st Birthday Sign for Party Decorations 21 Hanging Banner Photo Props Decor(Dark Blue)

Fulmoon$8.4610 rev

5mo ago

What buyers say about 21st birthday banner

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

What buyers love

Quality-Overall26%

“Great quality fully assembled IYKYK”

Value For Money9%

“Cant beat the price”

Fun/Entertainment Experience8%

“So fun”

Assembly/Installation7%

“It was easy to set up”

Color7%

“Nice color”

Size-Overall6%

“Great size”

Advertised Vs Actual Product6%

“Accurate Description”

Ease Of Use4%

“Easy to use”

Durability3%

“its durable”

Gifting Purpose3%

“Birthday surprise”

What buyers complain about

Assembly/Installation10%

“Tedious and time-consuming to put together”

Value For Money9%

“For what it is its expensive for me”

Material Quality9%

“Cheapest material”

Quality-Overall8%

“the balloons are bad quality”

Durability7%

“broke as it was opened”

Advertised Vs Actual Product6%

“Came with every letter but what's shown in the photo. Extremely upset”

Size-Overall6%

“Small”

Strength5%

“A little flimsy”

Thickness4%

“The letters are thin”

Adhesion/Stickiness3%

“The tape did not hold”

Top return reasons

Size-Overall38%

Color11%

Advertised Vs Actual Product9%

Value For Money8%

Quality-Overall6%

Functionality-Overall3%

Brightness/Shine/Glow3%

Material Quality3%

Defective Material/Parts3%

Assembly/Installation2%

Common questions

Is 21st birthday banner profitable to sell on Amazon United States?: The niche generates $85K/yr across 68 tracked products. 2 of 25 products launched in the last 360 days are still selling. 90-day search growth is +4.3%. Flapen's verdict: Worth a look (50/100).
How competitive is the 21st birthday banner niche?: 54 brands and 64 sellers compete. The top 5 products take 30% of clicks and top 5 brands hold 39% of demand.
What do buyers complain about in 21st birthday banner?: Top complaints mined from reviews: Assembly/Installation, Value For Money, Material Quality. The return rate is 3.4%.
When does demand for 21st birthday banner peak?: Demand is steady year-round — the busiest month runs 1.8× the quietest.
What does it cost to enter the 21st birthday banner niche?: Listings span $4.93–$20.44; the average listing price is $10.22 (sweet spot $15–$100). The average incumbent carries 688 reviews — the moat a new listing must climb.