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90 inch shower curtain liner

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A deep review moat (61,886 avg reviews) — this niche doesn't clear our bar today.

Market size 11Growth 33Conversion 79Competition 23Returns 82Price range 72Avg price 72Brand share 30Review moat 0Quality gap 37

Returns

Great1.7%

return rate — above 6% kills the launch gate

Conversion

Great8.0%

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

Avg price

Good$14.68

avg listing price — sweet spot $15–$100

Price range

Good$9.49–$29.43

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

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Growth

Okay+6.5%

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

Brand share

Okay87%

top-5 brand share — brands hold most of the demand

Competition

Bad73%

top-5 click share — a locked-up shelf

Market size

Bad$45K

$45K/yr · 38K searches

Review moat

Bad61,885.5

avg incumbent reviews — the moat a new listing must climb

Competition

The top 5 products capture 73% of clicks — a locked-up shelf that new listings rarely crack.

Brands

10 falling

Sellers

17

Top-5 brand share

87%

Open market

8%

  • AmazerBath49%
  • Barossa Design12%
  • ALYVIA SPRING12%
  • LiBa7%
  • Titanker6%
  • Tonnali5%
  • Open — no brand owns it (4 brands, 8%)

Product shelf

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%10%$4K20%$9K30%$13K40%$18K1001K10K100K1.0M Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 16 tracked products in this niche — three views at once, no toggling.

Demand

Weekly Amazon search volume, last 19 weeks — +6.5% search growth over the last 90 days.
1K600Spike '26Mar '26Mar '26Apr '26May '26May '26Jun '26

Reviews

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

What buyers love

Quality-Overall20%

“Good quality and easy to install”

Advertised Vs Actual Product13%

“As described”

Value For Money10%

“Great Value”

Size-Overall6%

“Fits perfect”

Thickness4%

“Nice thickness”

Weight Light4%

“Light and easy to hang”

Durability4%

“And durable”

Weight Heavy4%

“Real heavy duty”

Water Resistance3%

“Its fully waterproof”

Material Quality3%

“Good material”

What buyers complain about

Thickness16%

“Not as thick as it says”

Weight Heavy10%

“Weights are not heavy enough”

Quality-Overall10%

“This is low quality, flimsy”

Size-Overall5%

“Short”

Magnetic Strength/Adsorption5%

“Magnets dont stick”

Advertised Vs Actual Product4%

“misleading”

Weight Light4%

“Too Light and Not Enough Magnets/Weights”

Value For Money4%

“Only cuz it was half price”

Smell3%

“it has a smell”

Thin3%

“Extremely thin”

Top return reasons

Size-Overall45%
Material Quality9%
Thin8%
Advertised Vs Actual Product7%
Value For Money4%
Weight Heavy4%
Quality-Overall4%
Color2%
Magnetic Strength/Adsorption2%
Thickness2%