Losing the cap on your favorite growler is a real buzzkill. You finally get that perfect craft beer or homemade kombucha, and then you realize you have no way to seal it properly. A flimsy or ill-fitting lid can lead to flat, oxidized drinks and messy spills in your fridge or bag.
This guide breaks down the best growler caps available, focusing on 38mm screw-on lids for 1/2 and 1 gallon glass jugs. Whether you need a reusable plastic cap for everyday use, a sturdy metal lid for fermented beverages, or a budget-friendly pack for bottling, you’ll find the right fit here.
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Hufopik 6 Pcs 38mm Growler Caps, Beer Bottle caps Compatible with 1/2 Gallo…
Best forBasic replacement caps
- Reusable with gaskets
- Six caps per pack
ConsiderRequires exact 38mm fit
12 Pack 38mm Growler Caps Growler Lids Poly Seal Screw Caps Poly Seal Growl…
Best forHomebrewers needing bulk
- 12 caps for multiple uses
- Easy-grip ridged design
ConsiderPlastic may not suit all
Metal Growler Caps (3 Pack) – For 1-Gallon & 1/2-Gal Sized Glass Jugs – 1.5…
Best forAcidic fermented beverages
- Food-grade metal construction
- Plastisol liner for acidic drinks
ConsiderOnly 3 caps per pack
Patelai 36 Pcs 38 mm White Growler Caps Lids, Tinplate Metal Screw Caps
Best forBottling large batches
- 36 caps for many bottles
- Sturdy tinplate material
ConsiderNot reusable
Patelai 36 Pcs 38 mm White Growler Caps Lids, Tinplate Metal Screw Caps
Best forDisposable bulk caps
- Large quantity included
- Strong seal with glue
ConsiderCannot be reused
Marvexi 6Pcs 38mm Growler Caps
Best forEco-conscious reusable use
- Reusable and durable
- Excellent torque retention
ConsiderOnly 6 caps included
Metal Growler Caps For 1-Gallon & 1/2-Gal Sized Glass Growler Jugs – 1.5" (…
Best forLong-lasting metal lids
- Durable metal construction
- Plastisol liner for acidic drinks
Consider3-pack only
Metal Growler Caps (3-pk) – For 1-Gallon & 1/2-Gal Sized Glass Jugs – 1.5" …
Best forAirtight vacuum seal
- Forms vacuum seal
- Food-grade liner
ConsiderGeneric brand
Metal Growler Caps (3-pk) – For 1-Gallon & 1/2-Gal Sized Glass Jugs – 1.5" …
Best forSimple metal cap solution
- Consistent vacuum seal
- Food-grade materials
ConsiderLimited quantity
ZEAYEA 50 Pcs 38mm Poly Seal Screw Caps, Plastic Growler Caps Fit Most 1/2 …
Best forBulk bottling projects
- 50 caps for large batches
- Rust-proof phenolic resin
ConsiderBulk may be excessive
Hufopik 6 Pack 38mm Growler Caps – Reliable Seal
If you need a straightforward replacement for a lost growler lid, the Hufopik 6-pack is a solid choice. These black caps are made from high-quality polyethylene and come with sealing gaskets, so they resist cracking and leaking. The continuous thread design means they screw on smoothly, but you must confirm your bottle’s thread type and mouth diameter is 38mm before buying.
Each pack gives you six caps, which is handy if you have multiple growlers or want spares. They are reusable, so you can wash and reuse them many times without worrying about wear and tear. For a simple, no-fuss solution to keep your beer carbonated and spill-free, these caps deliver.
- Reusable with gaskets
- Six caps per pack
- Prevents leaks and carbonation loss
- Requires exact 38mm fit
- Thread type must match
DOMUEN 12 Pack Poly Seal Caps – Great Value
For those who want a larger supply, the DOMUEN 12-pack offers excellent value. These 38mm poly seal screw caps are made from low-density polyethylene, which provides good torque retention. That means they stay tight on your jug without loosening over time. The raised ridge around the circumference makes them easy to grip, even with wet hands.
Each cap has a cone-shaped insert that fits into the sealing area, creating a tight closure that prevents liquid leakage. They work with 1/2 and 1 gallon glass jugs, including Tap-a-Draft bottles. If you’re a homebrewer who bottles frequently, having a dozen caps on hand is practical and cost-effective.
- 12 caps for multiple uses
- Easy-grip ridged design
- Good torque retention
- Plastic may not suit all
- Check thread compatibility
The Kombucha Company Metal Caps – Durable Choice
Brand: The Kombucha Company
A premium metal cap that excels with kombucha and other acidic brews.
If you’re sealing acidic beverages like kombucha, the Kombucha Company’s metal caps are a smart upgrade. They feature a food-grade metal body with a plastisol liner that handles acidic liquids well. The continuous thread design ensures a secure fit on standard 1-gallon and 1/2-gallon glass jugs, preventing leaks and maintaining freshness.
These caps are made in the USA and come in a 3-pack, which is ideal if you have a few growlers in rotation. The plastisol liner creates a reliable seal that keeps carbonation in and oxygen out. For a durable, long-lasting lid that can withstand repeated use, this is a top pick.
- Food-grade metal construction
- Plastisol liner for acidic drinks
- Made in USA
- Only 3 caps per pack
- Metal may dent if dropped
Patelai 36 Pack Tinplate Caps – Single Use
Brand: Patelai
A cost-effective single-use cap for homebrew bottling sessions.
When you need a large quantity of caps for bottling, the Patelai 36-pack is a practical pick. These white tinplate lids are sturdy and come with a white sealing glue that provides a good seal. They are designed for one-time use, so they’re perfect for bottling batches of beer or kombucha for sharing or storage.
The caps have teeth around the edge, making them easy to screw on by hand. They fit 38mm glass jugs and offer reliable sealing to prevent leakage and carbonation loss. If you’re looking for a disposable option that won’t break the bank, this pack delivers.
- 36 caps for many bottles
- Sturdy tinplate material
- Easy to screw on
- Not reusable
- White color may show stains
Patelai 36 Pack White Caps – Same Reliable Seal
This second listing from Patelai offers the same 36-pack of white tinplate caps, so you get identical quality and performance. The caps are made from sturdy tinplate with a white sealing glue that ensures a tight closure. They are one-time use, which is ideal for bottling and gifting your homebrew.
Just like the other Patelai pack, these caps have a toothed edge for easy screwing. They fit 38mm glass jugs and prevent liquid and gas leakage. If you need a bulk supply of disposable caps, this is a dependable choice.
- Large quantity included
- Strong seal with glue
- Simple screw-on design
- Cannot be reused
- Limited color option
Marvexi 6 Pack Poly Seal Caps – Eco-Friendly
Brand: Marvexi
A solid reusable cap that balances performance with sustainability.
The Marvexi 6-pack offers a balance of quality and sustainability. These 38mm poly seal caps are made from low-density polyethylene, which provides excellent torque retention and prevents leaks. They are reusable, so you can use them many times without losing seal integrity, making them an eco-friendly choice.
The caps feature a user-friendly threaded mouth and a raised ridge for easy gripping. They fit 1/2 and 1 gallon jugs, ensuring a secure fit for your growlers. If you want a dependable, reusable cap that won’t crack or degrade, this set is worth considering.
- Reusable and durable
- Excellent torque retention
- Easy-grip design
- Only 6 caps included
- Plastic material may not suit all
Kombucha Company Metal Caps – Premium Seal
Brand: The Kombucha Company
A premium metal cap that provides a secure, lasting seal.
Another offering from The Kombucha Company, this metal cap set is nearly identical to the earlier one, with the same food-grade metal and plastisol liner. It’s designed for 1-gallon and 1/2-gallon glass jugs, making it versatile for beer, kombucha, and homebrew. The continuous thread design ensures a tight, leak-free closure.
These caps are made in the USA and come in a 3-pack. The plastisol liner is particularly good for acidic beverages, as it resists degradation. If you need a durable, high-quality cap that will last, this is a great option.
- Durable metal construction
- Plastisol liner for acidic drinks
- Made in USA
- 3-pack only
- Higher price per cap
Generic Metal Caps – Airtight Seal
These generic metal growler caps are a practical choice for anyone needing a reliable seal. They feature a non-removable plastisol liner that forms a vacuum when the product warms, creating an airtight, hermetic seal. This is especially useful for carbonated beverages like beer.
The caps have a 1.5-inch (38mm) outer diameter with a continuous thread (CT) design, fitting standard 38-400 neck finishes. They come in a 3-pack and are made in the USA. If you want a simple, effective metal cap without brand markup, this is a good buy.
- Forms vacuum seal
- Food-grade liner
- Made in USA
- Generic brand
- 3-pack only
Generic Metal Caps – Consistent Performance
This second generic metal cap listing offers the same features as the previous one: a 38mm continuous thread design and a plastisol liner that forms a vacuum seal. It’s a reliable option for sealing growlers and jugs, keeping your beverages fresh and carbonated.
Each pack includes 3 caps, and they are made in the USA. The liner is non-removable, which ensures a consistent seal every time. If you’re looking for a no-nonsense metal cap that works well, this is a solid pick.
- Consistent vacuum seal
- Food-grade materials
- Made in USA
- Limited quantity
- No brand warranty
ZEAYEA 50 Pack Poly Seal Caps – Ample Supply
If you need a large quantity of caps, the ZEAYEA 50-pack is hard to beat. These 38mm poly seal screw caps are made from high-quality phenolic resin, which offers excellent torque retention and is rust-proof. They are reusable, so you can use them multiple times without losing effectiveness.
The unique poly cone design inserts deeply into the sealing area, creating a hermetic, air-tight closure that prevents leaks and preserves freshness. The raised ridge around the circumference provides a non-slip grip for easy screwing. This is an excellent choice for homebrewers who bottle in bulk.
- 50 caps for large batches
- Rust-proof phenolic resin
- Hermetic seal
- Bulk may be excessive
- Plastic material only
Buyer’s Guide: What to Consider
Choosing the right growler cap depends on your specific needs. Consider the material, reusability, and seal quality to match your brewing or storage habits. Here are key factors to keep in mind.
- Measure Your Growler Mouth: Before buying any cap, measure the outside diameter of your growler's mouth, including the threads. Most standard growlers use 38mm caps, but some may be different. Use a caliper or ruler to ensure a proper fit.
- Check Thread Type: Growler caps come in continuous thread (CT) or interrupted thread designs. CT caps have a single continuous thread, while others may have multiple starts. Verify your bottle's thread type to ensure the cap screws on smoothly and seals correctly.
- Choose Material Based on Use: Plastic caps (polyethylene or phenolic resin) are lightweight, reusable, and resist cracking. Metal caps with plastisol liners are more durable and handle acidic beverages like kombucha better. Tinplate caps are sturdy but often single-use.
- Consider Reusability: If you plan to use the caps repeatedly, opt for reusable plastic or metal caps. Single-use tinplate caps are fine for bottling and gifting but will need replacement after each use. Check the product description for reusability notes.
- Evaluate Seal Quality: A good seal prevents leaks and maintains carbonation. Look for caps with sealing gaskets, poly cones, or plastisol liners that create a tight closure. Raised ridges or teeth can also improve grip and sealing ease.
Conclusion
Finding the best growler cap is about matching the cap to your bottle and your usage pattern. For everyday use, reusable plastic caps like the Hufopik or Marvexi offer convenience and value. If you handle acidic drinks or want a premium seal, the metal caps from The Kombucha Company or generic options are excellent.
For bulk bottling, the Patelai tinplate caps or ZEAYEA 50-pack provide ample supply. Always verify your growler’s diameter and thread type before purchasing. With the right cap, your beer and kombucha will stay fresh and leak-free.
Steven Settles is an ISCET-certified master in appliance repair. He has aced the National Appliance Service Technician Certification Exam, showcasing his exceptional diagnostic and repair skills. With an in-depth understanding of the latest repair technologies and a keen eye on evolving industry standards, Steven is a go-to expert for any appliance issue.