Best Plastic Caps For Pet Bottles: Compare Sizes and Styles

#1 · Best Overall

1. Home Brew Ohio 28mm PET Caps

• Weight: 2.4 oz

Best for: 16-ounce PET bottle refills.

Why it ranks #1: Made for 16 oz. PET bottles, these 28mm screw caps include tamper-evident rings and come as a 24-cap bag.

A tamper-evident ring gives these Home Brew Ohio caps a clear opening indicator for compatible 16-ounce PET bottles. The 24-cap bag suits repeat bottling or replacing used closures, while the screw-on format keeps the task familiar for anyone already working with matching bottles.

The stated fit for 16-ounce PET bottles makes these a focused choice for that bottle size, rather than a universal closure. Each cap includes a tamper-evident ring that separates when opened, providing a visible indication that the bottle has been opened. With 24 caps in the bag, you have replacements on hand for multiple fills. The listing does not give a neck-finish measurement, so the named 16-ounce bottle compatibility is the key fit reference.

Skip it if you need a closure for a different bottle size or finish; this listing specifies 16-ounce PET bottles.

Choose these for repeat filling of compatible 16-ounce PET bottles when an opening indicator and a 24-cap supply matter. The stated fit is specific to that bottle size, so other containers are outside the listed compatibility.

Listed on Amazon as: Plastic Screw Caps for PET Bottle, 28mm, bag of 24

#2 · Best 28/400 Fit

2. Generic 28/400 TE Caps

Best for: Kerr-finish 28/400 bottles.

Why it ranks #2: The food-grade 28/400 continuous-thread caps are listed for PET bottles and include tear-off tamper-evident rings in a 12-pack.

A tear-off tamper-evident ring stays on the bottle neck when the cap comes off, making prior opening visible on compatible containers. This 12-pack uses a 28/400 continuous-thread closure and is specified for bottles with a Kerr finish, including PET bottles, flasks, and wine bottles.

The 28/400 continuous-thread specification gives buyers a precise neck-finish reference for selecting compatible bottles, while the stated Kerr-finish requirement narrows that fit further. When opened, the cap’s tear-off ring remains attached to the bottle neck, giving a visible sign of prior access. The caps are described as food grade and about 20 mm tall including the 5 mm ring. Their fit should be judged by finish, not simply by bottle category.

Skip it if you have bottles without a Kerr finish; the Rozer 38 mm caps suit a different opening size.

These suit bottlers using Kerr-finish 28/400 containers who want an opening indicator on PET bottles, flasks, or wine bottles. Check the bottle finish before choosing; the broad container examples do not override the stated Kerr requirement.

Listed on Amazon as: 12PK Black Tamper EVIDENT Screw CAPS 28/400 Plastic TE Screw Top Caps for PET Bottles Flasks Boston Round and Wine Bottles to fit Most 28mm CT (Continuous Thread)

#3 · Best Color Choice

3. Dandat 28mm Water Caps

• Weight: 4.64 oz
• Material: Plastic
• Material Type: Plastic

Best for: Reusable 28 mm water bottles.

Why it ranks #3: These 28mm replacement caps come in blue and white, with 30 pieces per pack and a stated BPA-free material.

Reusable 28 mm screw lids come in a 30-piece set, giving households a practical supply for replacing water-bottle caps. Dandat lists a leak-proof feature and blue-and-white colors, while advising users to tighten the cap before putting a bottle in a backpack.

The 28 mm size identifies the intended closure dimension, and the screw-on design supports routine opening and resealing of water bottles. Dandat describes the caps as reusable and leak proof, with tightening before carrying specifically called out for backpack use. The 30-piece quantity supports repeated replacements, and the blue-and-white color pairing is intended to resemble original bottle caps. Hand washing is the listed care method, a useful constraint for maintenance.

Skip it if you want caps for machine washing; these are specified for hand washing only.

This set fits buyers replacing 28 mm water-bottle lids who value a reusable supply and familiar blue-and-white styling. For carry use, tighten each cap as instructed; hand washing is the listed maintenance method.

Listed on Amazon as: Dandat 30 Pcs Water Bottle Caps Plastic Screw Lids 28mm Leak Free Reseal

#4 · Best Inner Seal

4. MEETOOT 28mm Phenolic Caps

• Weight: 0.05 kg
• Material: Glass, Plastic, phenolic resin
• Material Type: Glass, Plastic, phenolic resin

Best for: 28 mm chemical and food bottles.

Why it ranks #4: The 28mm caps have a conical LDPE plug and poly seal, offering a distinct closure design for compatible bottles.

A conical LDPE plug inside the phenolic resin cap provides an internal sealing surface for compatible 28 mm bottle mouths. MEETOOT’s 12 black caps are described for daily chemicals, food, and cosmetics, with the insert intended to help retain liquid and limit leakage or gas escape.

The 28 mm diameter sets the bottle-mouth size to check, while the conical LDPE plug creates the listed internal seal. The phenolic resin construction is described as able to withstand fermentation pressure and chemicals, making the cap relevant to more than simple water-bottle replacement. The 12-piece set supports repeated use, and hand washing is the stated care instruction. The listing also mentions Boston glass bottles, so this is not limited to PET containers.

Skip it if you need a cap specifically listed for 38 mm openings; Ipetboom’s white screw-on caps target that size.

Consider these for compatible 28 mm bottles holding food, cosmetics, or daily chemicals when an internal plug and phenolic resin suit the application. The fit depends on the bottle mouth, and hand washing is the listed care method.

Listed on Amazon as: MEETOOT 12pcs Phenolic Resin Cover 28mm Black Poly Seal Screw Caps for Daily Chemicals, Food, Cosmetics Bottles

#5 · Largest Pack

5. Rozer 38mm Bottle Caps

• Weight: 7.68 oz
• Material: Plastic
• Material Type: Plastic

Best for: Bulk 38 mm juice bottle caps.

Why it ranks #5: The 50-piece pack suits buyers needing many replacements, but its 38mm diameter is wider than the leading 28mm options.

A 50-cap quantity makes the Rozer set useful for repeated replacements across compatible 38 mm bottle openings. Each black plastic cap measures 38 mm in diameter and 16.6 mm high, with stated suitability for several container capacities when the opening itself is 1.5 inches wide.

The 38 mm diameter is the central fit detail: the listing says these caps suit 4-, 8-, 12-, 16-, and 32-ounce containers only when the opening measures 1.5 inches wide. That opening-based guidance helps avoid choosing by capacity alone. A 50-piece pack provides a substantial supply for replacements, while the black plastic construction and stated 16.6 mm height identify the closure’s basic form. Measure the opening against the supplied dimensions before use.

Skip it if you need a 28 mm closure; Home Brew Ohio’s 28 mm caps are specified for 16-ounce PET bottles.

Pick this set for frequent replacement needs on containers whose openings measure 1.5 inches, including the listed capacity range. Its broad capacity examples do not make it universal: the 38 mm opening dimension remains the deciding fit consideration.

Listed on Amazon as: Rozer 50 Pcs Black Plastic Bottle Caps 38 mm for Empty Juice Bottles

#6

6. Ipetboom 38mm Caps

• Weight: 4.96 oz

Best for: 38 mm jug and juice replacements.

Why it ranks #6: These white 38mm screw caps are described for water jugs and juice bottles, making them a wider-neck replacement option.

A 38 mm inner diameter makes these Ipetboom caps a defined replacement option for compatible water jugs and juice bottles. The 30-piece white polypropylene set uses a screw-on design, and the listing describes the closure as helping preserve beverage integrity until opening.

The stated 38 mm size provides a useful selection point for matching jug and juice-bottle openings, while the screw-on format supports everyday closing and refilling. Ipetboom describes the cap as leak proof and as a seal that helps keep beverage contents intact until opened. A 30-piece pack supplies multiple replacements, and the smooth surface is presented as supporting production efficiency. The listing does not provide a neck-finish standard beyond the 38 mm inner diameter.

Skip it if you need a specified 28/400 Kerr finish; Generic’s black caps identify that neck-finish requirement.

This set suits buyers replacing 38 mm caps on compatible water jugs or juice bottles who want a bulk supply of white screw-on closures. Match the opening to the stated inner diameter; no neck-finish standard is provided.

Listed on Amazon as: Ipetboom 30Pcs Plastic Bottle Caps White Screw-On Cap 38mm Inner Diameter

#7

7. OLYCRAFT 37.5mm Caps

• Weight: 0.14 kg
• Material: Plastic
• Material Type: Plastic

Best for: 37.5 mm juice bottle lids.

Why it ranks #7: The blue caps have a stated 37.5mm inner diameter and tamper-seal design, but the listing does not specify a PET bottle finish.

A stated 37.5 mm inner diameter gives these OLYCRAFT caps a concrete fit reference for compatible juice bottles and dispensers. The 50 blue screw-on lids feature a tamper-seal design, making the set relevant where replacement closures and visible sealing are part of a repeat-use workflow.

The inner diameter of 37.5 mm, alongside an overall diameter of about 40 mm, helps identify the opening size these caps are intended to serve. Their screw-on form supports straightforward replacement, and the tamper-seal design is presented as a way to show whether someone has accessed the bottle. Fifty caps provide a sizeable supply for ongoing use. The listing describes sturdy plastic, but does not give a specific bottle neck-finish standard.

Skip it if you need a stated 28/400 neck finish; Generic’s black caps specify that continuous-thread standard.

Choose these for replacing closures on bottles or dispensers matching the stated 37.5 mm inner diameter, especially when a tamper-seal design and bulk quantity suit your workflow. The listing does not specify a neck-finish standard beyond that measurement.

Listed on Amazon as: OLYCRAFT 50Pcs Plastic Bottle Caps Blue Screw-On Caps 37.5mm Inner Diameter Bottle Jug Storage Lids Plastic Tamper Seal Lids Replacement Cap Twist Cap for Juice Bottles Dispenser Lid

#8

8. Kombucha Company 33/400 Caps

Best for: 33/400 lined container closures.

Why it ranks #8: A PE foam liner and 33/400 continuous thread suit matching containers, though the three-pack is not specifically identified for PET bottles.

A PE foam liner inside each ribbed polypropylene cap adds a sealing layer for containers with a 33/400 continuous-thread neck finish. This three-pack from The Kombucha Company suits buyers who can match that specific finish on bottles, jars, or jugs and want a lined closure.

The 33/400 neck-finish specification is the essential compatibility check, and the continuous-thread closure provides the matching screw-on format. A PE foam liner sits inside the cap to support a secure seal, while the ribbed exterior gives the closure its stated form. The listing names compatible container types ranging from Boston round bottles to F-style jugs, provided they have the matching finish. The three-pack is a small quantity for targeted replacement rather than bulk use.

Skip it if you have a 28 mm bottle finish; Home Brew Ohio’s caps are specified for 16-ounce PET bottles.

This three-pack suits buyers sealing compatible 33/400 bottles, jars, or jugs who want a PE foam liner beneath a continuous-thread cap. Verify the neck finish, since the listed container examples all depend on that match.

Listed on Amazon as: 33-400 White Ribbed Polypropylene Bottle Caps with PE Foam Liner, Continuous Thread Closure, 1-3/8" OD x 1/2" H, FDA Compliant (3 Pack) – The Kombucha Company

#9

9. Dbgogo Carbonation Cap

• Weight: 1.76 oz

Best for: Homebrew ball-lock carbonation.

Why it ranks #9: This three-pack is a ball-lock PET bottle filler for soda or beer, a specialized carbonation accessory rather than a standard screw cap.

A ball-lock connection sets this three-pack apart from ordinary bottle screw caps: the Dbgogo product is identified as a carbonation cap and PET bottle filler for soda and beer. It targets homebrewers working with that specialized filling setup, rather than buyers seeking a general-purpose replacement lid.

The title identifies both the ball-lock format and PET bottle filling, which points to a specialized role in soda or beer carbonation workflows. A three-pack gives the user multiple caps for the setup, while the compact package dimensions and low listed item weight indicate a small accessory that can be stored with brewing equipment. The supplied information does not state a thread size or detailed compatibility range, so the title’s ball-lock and PET-bottle description is the available selection guide.

Skip it if you need standard screw caps for everyday bottle closure; Rozer’s 38 mm caps are replacement screw caps.

This pack suits homebrewers seeking ball-lock carbonation caps for PET bottle filling with soda or beer. Its specialized connection distinguishes it from ordinary replacement closures, and the supplied listing does not provide further thread-size compatibility details.

Listed on Amazon as: Carbonation Cap, 3 Pack Ball Lock PET Bottle Filler for Soda Beer

#10

10. Totority 45mm Dispenser Caps

• Weight: 4.96 oz
• Material: Metal, Plastic
• Material Type: Metal, Plastic

Best for: PET gravity waterer replacements.

Why it ranks #10: These 45mm PET water-dispenser replacement lids are intended for pet fountains, not ordinary beverage bottles.

A 45 mm PET fountain lid targets replacement of a gravity-fed pet water dispenser cap, rather than a beverage bottle closure. Totority supplies six white caps and describes reinforced plastic intended to withstand repeated push-and-pull use in active-pet households.

The product is identified as a replacement cap for PET water dispensers and feeders, giving it a specific role in restoring an automatic watering setup. Its reinforced plastic construction is described as resisting frequent push-and-pull, while the secure replacement-cap design is meant to reduce accidental displacement. Six pieces provide replacements for multiple units or future wear. The listed 45 mm size is the relevant dimension to compare with the existing dispenser cap.

Skip it if you need caps for beverage bottles; Ipetboom’s 38 mm screw-on caps are listed for water jugs and juice bottles.

Choose these for replacing 45 mm lids on PET gravity water dispensers, especially where repeated pet access makes a reinforced replacement useful. The product’s stated purpose is feeder and fountain use, not standard beverage bottling.

Listed on Amazon as: 6pcs Dog Water Dispenser Bottle Cap Replacement, 45mm PET Fountain Lid