---
title: "One Piece Birthday Decorations — $380K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/home-kitchen/one-piece-birthday-decorations"
last_updated: "2026-08-10T17:02:05.522Z"
locale: en
meta:
description: "Niche score 57/100 · $380K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 57/100 · $380K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "One Piece Birthday Decorations — $380K/yr Amazon US Niche (2026) - Flapen"
---
# **one piece birthday decorations**
**Worth a look**
Shows low returns (0.9%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 55Growth 58Conversion 45Competition 54Returns 95Price range 64Avg price 82Brand share 43Review moat 84Quality gap 20
**Returns**
**Incredible****0.9%**
return rate — above 5% kills the launch gate
**Review moat**
**Great****315.18**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Great****$17.62**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$7.49–$28.39**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Growth**
**Good****+32.3%**
90-day search growth — must beat 0% to launch
**Market size**
**Good****$380K**
$380K/yr · 599K searches
**Competition**
**Good****52%**
top-5 click share — leaders hold, buyers still browse
**Conversion**
**Okay****3.6%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Okay****79%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500") [** Out of Stock**](https://flapen.com/research/niches?market=us&signal=out_of_stock "OOS rate > 10%")
According to Flapen's Amazon United States niche tracking, one piece birthday decorations is a $380K/yr Amazon United States market (599K searches/yr). The top 5 brands hold 79% of demand. Demand peaks in May–Jul–Aug. Verdict: Worth a look — 57/100.
Data updated Jul 23, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **one piece birthday decorations market data**
- **Units sold / yr**
- **15K–20K**
- avg 250–500/product
- **Revenue / yr**
- **$264K–$352K**
- units × avg price
- **Conversion rate**
- **3.6%**
- **Avg BSR**
- **#1,921**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **86%**
- **Out of stock**
- **20.6%**
- **Avg brand age**
- **27 months**
- **Avg seller age**
- **155 days**
## **Competition & brand share**
The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**15 **▼falling
**Sellers**
**19**
**Top-5 brand share**
**79%**
Top 20: 100%
**Top-5 click share**
**52%**
Top 20: 92%
**Open market**
**16%**
- MLEDUY27% - KROCEUS25% - FFGJA13% - Signreen9% - TYZZHOA6% - Get Trend5% - Open — no brand owns it (9 brands, 16%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +32.3% search growth over the last 90 days.
20K15KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: May, Jul, Aug · busiest ÷ quietest = 2.5×
[**Open Trend **](https://flapen.com/research/us/home-kitchen/one-piece-birthday-decorations/trend)
## **Top one piece birthday decorations search terms**
- **one piece birthday decorations**240K/yr+30.6%2.0% conv. - **one piece party decorations**81K/yr+41.4%1.7% conv. - **one piece birthday**48K/yr+22.0%1.2% conv. - **one piece decorations**40K/yr+35.1%1.3% conv. - **one piece party favors**23K/yr+52.6%0.9% conv. - **one piece anime birthday decorations**32K/yr+23.5%1.3% conv. - **one piece balloons**17K/yr+56.2%0.9% conv. - **one piece decorations birthday**19K/yr+27.0%1.6% conv. - **one piece party**16K/yr+25.7%1.2% conv. - **one piece party supplies**11K/yr+29.6%1.3% conv. [**All search terms **](https://flapen.com/research/us/home-kitchen/one-piece-birthday-decorations/search-terms)
## **Top one piece birthday decorations 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.
0%4%$15K8%$30K12%$46K16%$61K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Adeventure Themed Birthday Party Decorations Set - Including Banner Foil Balloons Printed Balloons Tablecloth for Themed Party**MLEDUY**$23.20**4.8★54 rev](https://www.amazon.com/dp/B0GC95S2Q2) [2**112PCS One Piece Birthday Party Supplies - 1 Banner 20 9 - inch Plates 20 7 - inch Plates 20 Cups 1 Tablecloth 20 Napkins 30 Spoons + Forks + Knives**KROCEUS**$28.39**4.2★41 rev](https://www.amazon.com/dp/B0FS273BXP) [3**98 PCS Birthday Party Supplies Party Decorations Include Theme Stickers Happy Birthday Banner Hanging Swirls Tablecloth Latex Balloons for Adult**Signreen**$14.38**4.5★14 rev](https://www.amazon.com/dp/B0GRTNWHN7) [4**H Cartoon For Party Supplies Birthday Decorations Set Include Banner Balloons Hanging Swirls Cake Cupcake Toppers for Boys Girls Party.**FFGJA**$21.63**4.3★11 rev](https://www.amazon.com/dp/B0GJP3LVSC) [5**Adeventure Themed Birthday Party Decorations Set - Cartoon Theme Party Supplies (Includes Banner Foil Balloons Printed Balloons Tablecloth Tableware Napkins)**MLEDUY**$27.61**4.9★42 rev](https://www.amazon.com/dp/B0GCBWMQ2X)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**41PCS One Piece Party Tableware 20 Plates and 20 Napkins and Tablecloth 71 x 42 Drl Birthday Party Decor Supplies**KROCEUS**$18.64**10 rev1mo ago](https://www.amazon.com/dp/B0H2VG9L4M) [**For One Piece Happy Birthday Banner Party Decoration With 6 Vortex Decorative Pendants**KROCEUS**$12.96**9 rev2mo ago](https://www.amazon.com/dp/B0H2GJYZRM) [**KROCEUS 30 PCS One Piece Themed Party Gift Bags Party Supplies Cute One Piece Anime Themed Party Birthday Decoration Gift Bags Suitable for Girls or Boys**KROCEUS**$9.97**9 rev2mo ago](https://www.amazon.com/dp/B0H25PVSH8) [**KROCEUS 86Pcs One Piece Birthday Party Supplies Party Gifts and Toy Set for Luffy Theme Party**KROCEUS**$23.06**10 rev3mo ago](https://www.amazon.com/dp/B0GWTSJXHB) [**98 PCS Birthday Party Supplies Party Decorations Include Theme Stickers Happy Birthday Banner Hanging Swirls Tablecloth Latex Balloons for Adult**Signreen**$14.38**14 rev4mo ago](https://www.amazon.com/dp/B0GRTNWHN7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**41PCS One Piece Party Tableware 20 Plates and 20 Napkins and Tablecloth 71 x 42 Drl Birthday Party Decor Supplies**KROCEUS**$18.64**4.4★**▲ 82%**](https://www.amazon.com/dp/B0H2VG9L4M) [**For One Piece Happy Birthday Banner Party Decoration With 6 Vortex Decorative Pendants**KROCEUS**$12.96**4.7★**▲ 81%**](https://www.amazon.com/dp/B0H2GJYZRM) [**KROCEUS 30 PCS One Piece Themed Party Gift Bags Party Supplies Cute One Piece Anime Themed Party Birthday Decoration Gift Bags Suitable for Girls or Boys**KROCEUS**$9.97**4.8★**▲ 81%**](https://www.amazon.com/dp/B0H25PVSH8) [**KROCEUS 86Pcs One Piece Birthday Party Supplies Party Gifts and Toy Set for Luffy Theme Party**KROCEUS**$23.06**5.0★**▲ 81%**](https://www.amazon.com/dp/B0GWTSJXHB) [**119 PCS Birthday Party Supplies Decorations Include Happy Birthday Banner Latex Balloon Tablecloth Paper Tableware Hanging Swirl**MLEDUY**$20.16**4.8★**▲ 77%**](https://www.amazon.com/dp/B0GRGKPF9P)
**~~View all trending →~~**
## **What buyers say about one piece birthday decorations**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**24%
*“This is a great quality set”*
**Value For Money**9%
*“Great price”*
**Advertised Vs Actual Product**9%
*“As advertised”*
**Gifting Purpose**8%
*“Perfect gift to my kid”*
**Color**7%
*“the colors are vibrant”*
**Size-Overall**7%
*“Good fit”*
**Design-Overall**5%
*“Cute design,”*
**Ease Of Use**3%
*“comfortable to wear”*
**Fun/Entertainment Experience**3%
*“an easy way to create a fun themed party”*
**Assembly/Installation**2%
*“easy to put up”*
### **What buyers complain about **
**Size-Overall**19%
*“they are kind of tight”*
**Quality-Overall**13%
*“quality control may be an issue”*
**Advertised Vs Actual Product**5%
*“False advertising”*
**Thickness**5%
*“.Feels as thick as paper stickers”*
**Value For Money**4%
*“Way too expensive for what was received- not sure if I can even return it since its all opened now”*
**Color**3%
*“But I am taking away one star because the colors in the decorations were very dull”*
**Durability**3%
*“After a month of use the decal is destroyed”*
**Assembly/Installation**3%
*“Assembly is required”*
**Material Quality**2%
*“Awful quality material”*
**Ease Of Use**2%
*“didnt open easily”*
### **Top return reasons **
**Size-Overall**34%
**Advertised Vs Actual Product**13%
**Quality-Overall**11%
**Value For Money**7%
**Functionality-Overall**5%
**Print Quality**3%
**Material Quality**3%
**Color**3%
**Leak-Proof**3%
**Inflation/Deflation**2%
## **Common questions**
- **Is one piece birthday decorations profitable to sell on Amazon United States?**
- The niche generates $380K/yr across 28 tracked products. 9 of 19 products launched in the last 360 days are still selling. 90-day search growth is +32.3%. Flapen's verdict: Worth a look (57/100).
- **How competitive is the one piece birthday decorations niche?**
- 15 brands and 19 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 79% of demand.
- **What do buyers complain about in one piece birthday decorations?**
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Advertised Vs Actual Product. The return rate is 0.9%.
- **When does demand for one piece birthday decorations peak?**
- Demand peaks in May–Jul–Aug; the busiest month runs 2.5× the quietest.
- **What does it cost to enter the one piece birthday decorations niche?**
- Listings span $7.49–$28.39; the average listing price is $17.62 (sweet spot $15–$100). The average incumbent carries 315 reviews — the moat a new listing must climb.
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