Is black king size pillow cases profitable to sell on Amazon United States?

The niche generates $60K/yr across 8 tracked products. 90-day search growth is -6.1%. Flapen's verdict: Skip it (33/100).

How competitive is the black king size pillow cases niche?

8 brands and 13 sellers compete. The top 5 products take 87% of clicks and top 5 brands hold 87% of demand.

What do buyers complain about in black king size pillow cases?

Top complaints mined from reviews: Color, Size-Overall, Quality-Overall. The return rate is 1.2%.

When does demand for black king size pillow cases peak?

Demand is steady year-round — the busiest month runs 1.4× the quietest.

What does it cost to enter the black king size pillow cases niche?

Listings span $6.07–$14.31; the average listing price is $9.78 (sweet spot $15–$100). The average incumbent carries 79,410 reviews — the moat a new listing must climb.

black king size pillow cases

Skip it

A deep review moat (79,410 avg reviews) — this niche doesn't clear our bar today.

Conversion

Incredible12.9%

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

Returns

Great1.2%

return rate — above 5% kills the launch gate

Avg price

Okay$9.78

avg listing price — sweet spot $15–$100

Brand share

Okay87%

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

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-6.1%

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

Market size

Bad$60K

$60K/yr · 47K searches

Competition

Bad87%

top-5 click share — a locked-up shelf

Review moat

Bad79,410.38

avg incumbent reviews — the moat a new listing must climb

Price range

Bad$6.07–$14.31

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

According to Flapen's Amazon United States niche tracking, black king size pillow cases is a $60K/yr Amazon United States market (47K searches/yr). The top 5 brands hold 87% of demand. Verdict: Skip it — 33/100.

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

black king size pillow cases market data

Units sold / yr: 6K–8K; avg 1,000–1,250/product
Revenue / yr: $59K–$78K; units × avg price
Conversion rate: 12.9%
Avg BSR: #57
Page quality: 0%
Prime: 100%
Sponsored: 75%
Out of stock: 0.0%
Avg brand age: 56 months
Avg seller age: 197 days

Competition & brand share

The top 5 products capture 87% of clicks — a locked-up shelf that new listings rarely crack.

Brands

8 rising

Sellers

Top-5 brand share

87%

Top 20: 100%

Top-5 click share

87%

Top 20: 100%

Open market

NTBAY57%
FLXXIE9%
Utopia Bedding8%
CGK Unlimited7%
ROYALE LINENS5%
Amazon Basics5%
Open — no brand owns it (2 brands, 8%)

Demand & seasonality

Weekly Amazon search volume, last 101 weeks — -6.1% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top black king size pillow cases search terms

black king pillow cases set of 211K/yr +1.1%11.6% conv.
black king size pillow cases10K/yr +10.2%10.8% conv.
black king size pillow cases set of 27K/yr -16.3%14.9% conv.
black king pillow cases9K/yr -36.7%10.6% conv.
king size black pillow cases4K/yr +37.6%11.4% conv.
black pillow cases king3K/yr +14.4%11.8% conv.
black pillow cases set of 2 king3K/yr -34.6%11.8% conv.

All search terms

Top black king size pillow cases 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★)

All 8 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

NTBAY King Pillowcase Set - 2 Pack Brushed Microfiber 20x36 Pillowcases - Soft Wrinkle-Free Fade-Resistant Stain-Resistant Black Pillowcases with Envelope Closure - 20x36 Inches Black

NTBAY$9.414.6★112,791 rev

FLXXIE King Pillow Cases Set of 2 Soft Microfiber Pillow Covers with Envelope Closure Wrinkle Fade and Stain Resistant Pillowcases 20x36 Black

FLXXIE$9.664.6★60,571 rev

Utopia Bedding King Pillow Cases - 4 Pack - Envelope Closure - Soft Brushed Microfiber Fabric - Shrinkage and Fade Resistant Pillow Covers King Size 20 X 40 Inches (King Black)

Utopia Bedding$11.354.6★72,553 rev

King Pillow Cases Set of 2 - Ultra Soft Hotel Quality Pillowcase Covers - Comfy Cozy & Wrinkle Free - Shrinkage Stain and Fade Resistant - Machine Washable Pillow Protectors - 2 Piece Set - Black

CGK Unlimited$14.314.6★57,433 rev

Royale Linens King Pillowcase Set of 2 - Bed Pillow Cover - 20 x 40 -Black Pillowcases - 1800 Brushed Microfiber Wrinkle & Fade Resistant - Soft & Cozy- King Size Pillow Case (Black)

ROYALE LINENS$7.674.6★1,285 rev

Newest

by launch date

MINIPANDA Black King Size Pillow Cases Set of 4 Envelope Design Pillowcase

MINIPANDA$9.651,898 rev

1y ago

Royale Linens King Pillowcase Set of 2 - Bed Pillow Cover - 20 x 40 -Black Pillowcases - 1800 Brushed Microfiber Wrinkle & Fade Resistant - Soft & Cozy- King Size Pillow Case (Black)

ROYALE LINENS$7.671,285 rev

5y ago

Utopia Bedding King Pillow Cases - 4 Pack - Envelope Closure - Soft Brushed Microfiber Fabric - Shrinkage and Fade Resistant Pillow Covers King Size 20 X 40 Inches (King Black)

Utopia Bedding$11.3572,553 rev

6y ago

Bedsure King Size Satin Pillowcase Set of 2 - Black Silky Pillow Cases for Hair and Skin with Envelope Closure Similar to Silk Pillow Cases Gifts for Women Men 20x36 Inches 2pcs

Bedsure$10.16319,945 rev

7y ago

FLXXIE King Pillow Cases Set of 2 Soft Microfiber Pillow Covers with Envelope Closure Wrinkle Fade and Stain Resistant Pillowcases 20x36 Black

FLXXIE$9.6660,571 rev

7y ago

What buyers say about black king size pillow cases

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

What buyers love

Soft Feel19%

“Soft and smooth”

Quality-Overall11%

“Amazon Basics Standard Pillow Cases: Seems like a very good quality”

Size-Overall10%

“Fit well”

Comfort-Overall9%

“very comfortable”

Cushion8%

“the envelope closure keeps the pillow in place nicely”

Value For Money8%

“Good deal”

Color5%

“So, many lovely colors”

Advertised Vs Actual Product4%

“is as advertised”

Material Quality3%

“Great material”

Foam2%

“Great sheets, very comfy to sleep on”

What buyers complain about

Color19%

“Do not buy the dark colors”

Size-Overall12%

“Awful not a queen size”

Quality-Overall12%

“Bad quality”

Thickness6%

“Their a little thin”

Durability5%

“it does not come off”

Stitch/Finish/Polish5%

“Low quality stitching”

Material Quality3%

“Not super great material”

Soft Feel3%

“Not as soft as some satins”

Comfort-Overall3%

“Pillows flat, not comfortable”

Grip3%

“Slide off”

Top return reasons

Size-Overall35%

Material Quality20%

Color12%

Cushion6%

Quality-Overall5%