Best Rectangular Plastic Liners For Planters for Window Boxes

#1 · Best Overall

1. Winlyn Clear Rectangular Liners

• Dimensions D x W x H: 3"D x 16.2"W x 3.5"H
• Dimensions: 16.2 x 3.5 x 3 in
• Size: 16.7" L x 3.5" W x 3.5" H

Best for: Clear window-box protection.

Why it ranks #1: Its clear rectangular liners measure 16.2 x 3 x 3.5 inches, come in a 10-piece pack, and list a drainage-hole feature.

A clear 10-piece set in a slim 16.2-by-3-by-3.5-inch profile gives window-box owners multiple liners for arranging plants or protecting planter interiors. The see-through plastic keeps the underlying planter visible, while the listed drainage-hole feature supports drainage-focused planting setups.

Each liner measures 16.2 inches long, 3 inches wide, and 3.5 inches high, a narrow shape suited to compatible flower boxes and windowsills rather than broad containers. The pack of 10 supplies spares for several planters or replacements, and the plastic construction is described as lightweight, shatterproof, and fade-resistant for repeated indoor or outdoor use. They can also be used as standalone planter boxes, giving the set more than one placement option.

Skip it if you need a wide soil bed; this liner is only 3 inches across and has a slim window-box profile.

Choose these for narrow window boxes, windowsills, or patio arrangements where clear plastic and multiple liners are useful. Their 3-inch width is the key boundary, so compare the planter’s interior dimensions before relying on them for a specific box.

Listed on Amazon as: 10 Pcs Plastic Planter Liners Clear Rectangular Plastic Liners for Flower Box Planter Window Box Planter 16.2" L x 3" W x 3.5" H for Indoor Outdoor Flower Arrangement Succulent Garden Windowsill Decor

#2 · Largest Pack

2. Domensi Clear Rectangular Liners

• Dimensions D x W x H: 16.93"D x 8.07"W x 4.13"H
• Dimensions: 16.93 x 8.07 x 4.13 in
• Size: 16.2 x 3 x 3.5 in

Best for: Large clear replacement supply.

Why it ranks #2: The 25-piece clear set shares the useful 16.2 x 3 x 3.5-inch listed size, suiting buyers who want several matching inserts.

Twenty-five clear liners in a 16.2-by-3-by-3.5-inch size provide a substantial replacement supply for narrow flower boxes and windowsill arrangements. Domensi specifies use for shielding wooden planters from corrosion or damage, so the set pairs a familiar rectangular format with enough pieces for multiple planting projects.

The 16.2-inch length and 3-inch width suit compatible slim rectangular boxes, while the listed 3.5-inch height offers a defined depth for planting arrangements. Clear plastic lets the underlying box remain visible, and the product description presents the liners as protection against corrosion or damage to wooden flower boxes. Having 25 pieces supports use across several containers or replacement needs. Wooden flower pots are not included, so the purchase is for liners only.

Skip it if you need a deep or wide planting insert; this liner is 3 inches wide and 3.5 inches high.

Consider this set for gardeners lining multiple compatible narrow wooden boxes or windowsill planters and wanting clear inserts in quantity. The liners are sold without wooden pots, and their 3-inch width is the main fit boundary.

Listed on Amazon as: 25 Pcs Plastic Liners for Planters Planter Box Liner Clear Rectangular Plastic Window Flower Box 16.2" l x 3" W x 3.5" H for Indoor Outdoor

#3 · Longest Rectangular Size

3. Generic 20-Inch Planter Liners

• Dimensions D x W x H: 3"D x 19.5"W x 3.75"H
• Dimensions: 3 x 19.5 x 3.75 in
• Size: Rectangular 20"x4"

Best for: Standard 20-inch planter inserts.

Why it ranks #3: Its transparent liners measure 19.5 x 3 x 3.75 inches and are specified to fit inside a standard 20-inch planter.

A 19.5-inch length is specified to fit inside a standard 20-inch planter, making this 12-piece transparent set a targeted option for lining compatible wood boxes. The plastic creates a barrier between soil and planter material, helping limit soil leakage and water-related surface or pot damage.

The 19.5-by-3-by-3.75-inch dimensions give buyers a concrete starting point for matching a narrow 20-inch box, while the listing specifically identifies standard 20-inch planters as the intended fit. Transparent plastic preserves visibility of the underlying planter, and the liner barrier helps keep soil from leaking onto surrounding surfaces. With 12 pieces included, the set can serve several compatible boxes or provide replacements; the planter itself is not included.

Skip it if you have a wide or unusually sized planter; the stated fit is a standard 20-inch box with a 3-inch-wide liner.

Pick these for narrow, standard 20-inch wood planters where a clear barrier against soil and water is the priority. The planter is not included, and the 3-inch width makes interior measurements important for a reliable fit.

Listed on Amazon as: Clear Plastic Liners Inserts for Wood Boxes and Planters (19.5” x 3”x 3.75”) l (Sell in Pack of 12) (to fit Standard 20" Planter) (L200404)

#4 · Largest Set

4. BreezeHug Black Rectangular Liners

• Dimensions D x W x H: 11.02"D x 7.87"W x 6.1"H
• Dimensions: 11.02 x 7.87 x 6.1 in
• Size: 10.5x3x3.5 in

Best for: Bulk set for narrow boxes.

Why it ranks #4: This 36-piece black set has explicitly rectangular 10.5 x 3 x 3.5-inch liners and lists a seamless molded design.

Thirty-six black liners measuring 10.5 by 3 by 3.5 inches give busy gardeners a sizable supply for repeated narrow-box planting projects. BreezeHug identifies them for 12-inch planters or window boxes, and the compact rectangular profile helps organize seedlings and arrangements in compatible containers.

The 10.5-inch length and 3-inch width suit narrow planter interiors, while the listing says the liners fit 12-inch planters or window boxes without loosening. A seamless molded design and leak-prevention feature provide a barrier for soil and water, and the weather-resistant plastic supports outdoor placement. Their lightweight construction makes handling easier during garden maintenance, while the 36-piece quantity is useful when preparing many containers or keeping replacements available.

Skip it if you need a broad planting bed; these liners are only 3 inches wide and are specified for narrow planters.

This set fits gardeners preparing many narrow window boxes or compatible 12-inch planters, especially where weather-resistant inserts and replacements matter. Check that the 10.5-inch liner length and 3-inch width suit the container and the plants’ space needs.

Listed on Amazon as: BreezeHug 36 Pcs Plastic Planter Liners Rectangular Plastic Inserts 10.5" x 3" x 3.5" for Planter Window Box Indoor Outdoor Flower Arrangement Succulent Garden Windowsill Home Decor

#5

5. ORFOFE Transparent Nursery Pots

• Dimensions D x W x H: 4.72"D x 4.72"W x 4.72"H
• Dimensions: 4.72 x 4.72 x 4.72 in
• Size: 12.00X12.00X12.00CM

Best for: Clear root-monitoring inserts.

Why it ranks #5: The 10-piece transparent nursery-pot set is listed at 12 x 12 x 12 cm, but its square dimensions do not match a narrow rectangular box.

Transparent plastic makes root development and soil moisture easier to observe, giving these ORFOFE liners a practical monitoring role alongside plant display. The 10-piece set measures 4.72 inches on each listed side, so it targets compact nursery-pot use rather than long rectangular window-box planting.

At 12 centimeters, or 4.72 inches, on each listed side, these are small square inserts despite the rectangular wording in the title. Their clear construction lets gardeners check root growth and soil moisture without removing the liner, while the inner-liner design supports quick plant replacement when refreshing an indoor display. The package includes 10 pieces. No specific drainage feature is listed, so buyers should rely on the stated dimensions and monitoring function when judging suitability.

Skip it if you need a long planter liner; these are only 4.72 inches on each listed side and suit compact containers.

Choose these for small indoor plant displays where watching roots and soil moisture is useful and plant changes are frequent. The listed 4.72-inch square size is a firm boundary, so they do not replace a long window-box liner.

Listed on Amazon as: ORFOFE 10 Pack Rectangular Plastic Planter Liners for Herbs, Indoor Use

#6

6. BESPORTBLE Transparent Nursery Pots

• Dimensions D x W x H: 4.72"D x 4.72"W x 4.72"H
• Dimensions: 4.72 x 4.72 x 4.72 in
• Size: 12.00X12.00X12.00CM

Best for: Airy seedling-pot inserts.

Why it ranks #6: Its 10 transparent pots measure 12 x 12 x 12 cm and the listing mentions airflow, though the supplied dimensions indicate square pots.

A transparent finish lets growers observe plant condition and root systems, while the liner material is described as promoting airflow. BESPORTBLE’s 10-piece set measures 4.72 inches on each listed side, making it a compact option for seedling-scale containers rather than elongated planter boxes.

The 4.72-inch dimensions on each side point to small, square nursery inserts, despite the product’s planter-liner wording. Clear plastic supports visual checks of growth and root systems without taking the liner out, and the airflow-focused material is presented as helping maintain healthy conditions and supporting growth. The pack of 10 can serve a group of seedlings or several small displays. The listing also identifies home and office use, making the transparent look suitable for indoor arrangements.

Skip it if you need a long, narrow planter insert; these are listed at 4.72 inches on each side.

These suit seedling growers and indoor gardeners who want to observe roots and use small transparent inserts in compatible containers. Their square 4.72-inch dimensions limit them to compact setups, not standard elongated window boxes.

Listed on Amazon as: 10 Pack Plastic Planter Pot Liners for Seedlings

#7

7. MERRYHAPY Nursery Pots

• Dimensions D x W x H: 4.72"D x 4.72"W x 4.72"H
• Dimensions: 4.72 x 4.72 x 4.72 in
• Size: 12.00X12.00X12.00CM

Best for: Compact liners for plant rotation.

Why it ranks #7: The 10-piece transparent set measures 12 x 12 x 12 cm and supports plant swaps, but is not listed in a long rectangular size.

An inner-liner design makes it easier to replace plants, giving this transparent 10-piece MERRYHAPY set a useful role in refreshed indoor displays. Each listed side measures 4.72 inches, a compact nursery-pot scale that is better matched to small containers than long rectangular planter boxes.

The listed 12-by-12-by-12-centimeter dimensions create a compact square profile, so buyers should treat these as small nursery-style inserts rather than elongated trough liners. Their clear plastic allows observation of plant growth and health, while the inner-liner format helps with swapping plants when updating a collection. Ten pieces are included, supporting several small arrangements. The product description mentions home and office decor, linking the transparent appearance to indoor display use without requiring a change to the outer pot.

Skip it if you need a long rectangular flower-box liner; these measure 4.72 inches on each listed side.

A practical choice for indoor plant owners who rotate small plants and want clear inserts that keep growth visible. The 4.72-inch square dimensions define the fit: measure a compact pot, and do not treat these as long trough liners.

Listed on Amazon as: 10Pcs Plastic Nursery Pots, Rectangular Plant Liners for Gardening

#8

8. JOINPAYA Nursery Pot Liners

• Dimensions D x W x H: 5.12"D x 5.12"W x 5.12"H
• Dimensions: 5.12 x 5.12 x 5.12 in
• Size: 13.00X13.00X13.00CM

Best for: Airflow-focused plant swaps.

Why it ranks #8: This 10-piece transparent set measures 13 x 13 x 13 cm and mentions hanging baskets, yet its listed dimensions are square.

A breathable liner material paired with an inner-liner format supports airflow around the soil and makes plant changes simpler. The 10-piece transparent set is described for flower pots, hanging baskets, and window settings, giving gardeners several small containers to use across different displays.

The listed dimensions are 5.12 inches on each side, so these are compact nursery-style inserts rather than long window-box liners. Their inner-liner design lets a gardener switch plants without replacing the surrounding display container, a practical benefit for rotating arrangements. JOINPAYA also describes the material as promoting air circulation and healthy soil conditions. The pack contains 10, and the transparent finish keeps the liner visually unobtrusive in a compatible pot or basket.

Skip it if you need a long, narrow window-box insert; these measure 5.12 inches on each side rather than forming a long trough.

These suit gardeners who want small transparent inserts for plant swaps in compatible pots or hanging baskets. Their 5.12-inch square dimensions are a meaningful fit boundary, so they are not the right shape for a standard-length window box.

Listed on Amazon as: 10Pcs Plastic Nursery Pot Liners, Rectangular Plant Containers

#9

9. NUOBESTY Nursery Pot Liners

• Dimensions D x W x H: 5.12"D x 5.12"W x 5.12"H
• Dimensions: 5.12 x 5.12 x 5.12 in
• Size: 13.00X13.00X13.00CM

Best for: Compact liner for easy swaps.

Why it ranks #9: Its 10 transparent nursery pots measure 13 x 13 x 13 cm; the listing describes plant replacement and airflow rather than rectangular-box fit.

An inner-liner design makes seasonal plant changes easier, while the material is described as supporting air circulation around the soil. NUOBESTY supplies 10 transparent nursery-style liners, each listed at 5.12 inches on each side, for small compatible planting displays rather than long window boxes.

These compact inserts measure 13 centimeters, or about 5.12 inches, on each listed side, so their square dimensions favor small pots over elongated planter boxes. The inner-liner arrangement allows plants to be switched without changing the surrounding display container, supporting seasonal refreshes. NUOBESTY also describes the material as promoting airflow and healthy soil conditions. Ten pieces arrive in the set, and the transparent finish makes the liners less visually prominent in a compatible container.

Skip it if you need an elongated window-box insert; these measure about 5.12 inches on each side and are nursery-pot sized.

These are a fit for indoor gardeners rotating plants in compact, compatible containers and who value transparent inserts and airflow. Their square 5.12-inch dimensions are the important boundary; measure the receiving pot rather than assuming a long-box fit.

Listed on Amazon as: Plastic Nursery Pots Liners 10pcs Rectangular Planter

#10

10. FRCOLOR Nursery Pot Liners

• Dimensions D x W x H: 5.12"D x 5.12"W x 5.12"H
• Dimensions: 5.12 x 5.12 x 5.12 in
• Size: 13.00X13.00X13.00CM

Best for: Clear inserts for small displays.

Why it ranks #10: The 10-piece transparent nursery-pot set is listed at 13 x 13 x 13 cm, making it a poor match for a narrow rectangular planter.

Transparent construction helps monitor roots and soil conditions, making these FRCOLOR liners useful where plant observation matters. The 10-piece set is listed at 5.12 inches on each side and is described for flower pots and hanging baskets, placing it in compact-container territory rather than long window boxes.

At approximately 13 centimeters, or 5.12 inches, on each listed side, these are compact nursery-style inserts despite the rectangular title. The clear material makes roots and soil conditions visible, while the product description identifies adaptable use in traditional flower pots and hanging baskets. A 10-piece quantity supports several small displays, and the lightweight feature can make handling easier when moving liners between compatible containers. The stated dimensions remain the key consideration when matching them to a pot or basket.

Skip it if you need a long window-box liner; these measure about 5.12 inches on each listed side and suit compact pots or baskets.

Consider these for gardeners monitoring roots in small pots or hanging-basket displays who want several transparent inserts. The compact square dimensions are the main limit; check the receiving container’s shape and measurements before choosing them.

Listed on Amazon as: Rectangular Plastic Nursery Pot Liners, 10pcs for Seedlings