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Welcome to the Urban Worm Bag HQ!

The web’s top resource for the Urban Worm Bag, direct from the manufacturer and owner of the Urban Worm Company.

This page will help you figure out if the Urban Worm Bag is for you and answer some frequently asked questions about “The UWB.”

What Is the Urban Worm Bag?

The Urban Worm Bag is a small-scale continuous flow worm composting bin designed to turn your kitchen and office waste into an incredibly effective organic fertilizer and soil amendment called worm castings.

The Bag itself is built from a strong 900D Oxford fabric and is suspended from a sturdy metal frame with reinforced plastic connectors.

You simply feed from the top and harvest your worm castings from the bottom in a few short months.

New Design!

Many customers run their worm bins way too wet. This tendency was simply not compatible with the zipper at the bottom of the Urban Worm Bag.

So we decided to remove this zipper altogether, finally settling on a buckle-and-velcro system to secure the bottom of the bag.

The best part? Aside from not being susceptible to corrosion and calcification, this patent-pending bottom is fully removable and can serve as a catch for your worm castings.


Urban Worm Bag harvested with bottom detached

Why Did I Create the Urban Worm Bag?

In early 2017, I noticed the market lacked a breathable worm composting bin that was available to the general public. While there were a couple others on the market, I felt they were over-priced considering they did not come with a frame, requiring customers to build their own.

So I set out to create a breathable home worm at a reasonable price that didn’t require any DIY skills.


What Kind of Foods Can Worms Eat in the Urban Worm Bag?

Worms will eventually eat and and all organic waste.

But in a worm bin, you should only feed them non-meat and non-dairy waste to prevent rotting, unwanted odors, and to maintain a safe, pathogen-free vermicompost. The adjacent graphic to the shows you a list of safe nitrogen-rich “green” foods like vegetable and fruit waste and coffee grounds with excellent carbon-rich “brown” foods like newsprint, coco coir, paper, and aged horse manure.

Moderation is key. Excess feeding of green foods or watering can lead to a stinky, oxygen-deprived environment.

The Urban Worm Bag’s fabric construction contributes to a healthy, aerobic environment where the worms and beneficial microbes can thrive.

Where Should the Urban Worm Bag Be Used?

Just like people and other fleshy creatures, composting worms like a temperate environment.

And because we all don’t live in San Diego, the Urban Worm Bag is best used indoors if at all possible. But if necessary, it can be used on a sheltered patio in climates without harsh winters.

It is very important that the frame rest on a flat, level surface.


Because the frame is rigid, yet the Bag will always be pulled in the same direction thanks to gravity, using the Urban Worm Bag on an uneven or significantly pitched surface can warp the connectors.

How Long Until I Can Harvest the Urban Worm Bag?

Patience, patience. 

Worm composting doesn’t happen overnight.

In most cases, it will take about 4 to 6 months to harvest a significant amount of worm castings (I call a gallon significant).

When you do decide to harvest, place a small tray or short bucket under the Urban Worm Bag. Open up the bottom.

Loosen the interior drawstring and open the interior fabric liner. An initial amount of castings may drop in the container below, but it may be necessary to bang on the sides of the Bag to disturb the castings.


Other Frequently Asked Questions

General Questions

What are the specs on the Urban Worm Bag?

What Are the Urban Worm Bag Specs?

  • Width: 27 ¾ in (70cm)
  • Length: 27 ¾ in (70cm)
  • Height: 30 ¼ in (77cm)
  • Bag Only Height: 22 in (56cm)
  • Bag Only Width: 24 in (61 cm)
  • Bag Only Length: 24 in (61 cm)
  • Weight: 10 lbs (4.5 kg)
  • Weight in Box: 10.2  lbs (4.6 kg)
  • Volume at Max Load: 5.3 cubic ft (122 liters)
  • Fabric: 900D Oxford with a polyurethane coating for moisture resistance
  • Frame: Lightweight iron frame with 8 plastic 3-way connectors
Why doesn't the Urban Worm Bag have a tap like the Worm Factory 360?

A properly maintained worm bin should not be producing leachate and adding a tap to the product would suggest that it should.

Leachate is often anaerobic and/or pathogenic and presents a risk to your plants if you choose to treat them with it.

The Urban Worm Bag’s depth and breathable fabric construction reduces the likelihood of conditions that would result in leachate.

Where is the Urban Worm Bag manufactured?

Currently, the Urban Worm Bag is manufactured in China. This does cause me a little bit of heartache.

I researched US suppliers and could not find a reasonable unit cost at my current order quantity.

Many quotes for the frame only were higher than the quote for the frame AND the bag overseas. However, as the operation grows, I will certainly be approaching these suppliers again to see if the Urban Worm Bag can be made in the US.

However, I have been very impressed with the thoroughness of my Chinese factories and their engineers who have provided detailed feedback and design inputs to create a high-quality product.

Are you offering international shipping?

If you are in Canada, the Urban Worm Bag is available on Amazon.ca!

If you are in Europe, the Urban Worm Bag is available via https://wormsystems.com and Amazon.

Outside of those countries, the Urban Worm Bag may be available, but the shipping costs, especially for units with the frame, may be prohibitive.

Can I download the Owner's Manual?


Warning: It’s a huge file!

What quantity of worm castings can I expect to harvest?

This answer will vary greatly, depending on your feeding schedule, your climate, and other factors.

But one of my first – and most experienced – customers harvests about 1 to 1.5 gallons per week from her Urban Worm Bag.

She uses mostly leaf mold and small amounts of food waste. The texture of leaf mold is such that it can yield large amounts of vermicompost. You will get less with a combination that includes more paper and cardboard waste.

Operating the Urban Worm Bag 

How do I maintain proper moisture?

Maintaining high levels of bedding will prevent the problems that arise with overfeeding and overwatering. Bedding absorbs the excess water introduced by water-laden food waste.

Operating the Urban Worm Bag with the bottom zipper open (or fully removed for the most updated version) is also an excellent idea to ensure appropriate moisture and ensure an easier, worm-free harvest.

How much should I feed my Urban Worm Bag?

This will depend on how many worms you have and how well they have processed the existing waste.

In general, any worm bin should not be fed more than 25-33% of the weight of the worms daily. For a fully mature Urban Worm Bag, this means you should not plan to feed more than 1 to 1.5 pounds daily.

This will still be a lot of food, so it’s important to keep a close eye on the bin and do not feed more if it looks like the worms have begun processing the previous day’s feeding.

What is the best choice of worms?

In most circumstances, red wigglers (eisenia fetida) are the best choice as they are able to tolerate the widest range of conditions.

However, we have plenty of customers happily using European nightcrawlers, African nightcrawlers, and Indian blue worms.

How many worms should I buy?

I recommend starting with 1-2 lbs of composting worms for an Urban Worm Bag.

I invite you to order from my trusted supplier at a discount!

I see condensation inside my top lid. Is this normal?

Condensation on the inside lid of the Urban Worm Bag is very common, especially soon after a feeding or a watering.


My worm bin has fruit flies! Help!

Fruit flies are indicative of conditoons that are too wet and/or too rich in foods. Adding dry bedding and burying food waste under ther top layer can also help reduce the likelihood that fruit flies are attracted to your bin.

While the Urban Worm Bag does a good job of keeping unwanted critters out of your bin, keep in mind that fruit fly larvae may have been present on your food waste before you put it in your bin.

Please read this article on how to deal with fruit flies in your worm bin!

Why is my Urban Worm Bag leaking?

Your Urban Worm Bag has been overwatered, overfed, or both.

  • Stop feeding or watering your bin.
  • Open the bottom zipper.
  • Add dry bedding.
  • Stuff dry bedding into the bottom of the Bag to absorb excess moisture.
Can I resell the Urban Worm Bag?

Yep. I currently offer very good rates on drop shipping, bulk, and wholesale purchases.

Please e-mail me to arrange a reseller account.


Can I use the Urban Worm Bag in a commercial vermicomposting business?

 The short answer is “yes,” but the Urban Worm Bag is designed more for home use.

You could use several Urban Worm Bags to create “small batch”-style castings with different feedstocks to create different vermicompost (ie, fungal-dominant rather than bacterial), but a mid- to large-scale operation should be considering an industrial-level continuous flow-through system like the kind offered at Michigan SoilWorks.


How can I use my worm castings?

This is up to you! But most people prefer to use worm castings and a soil amendment at a 10% substitution rate or apply it directly to the base of their plants as a top dressing.

Note: This will not burn the plants or the roots.

You can also brew worm tea by mixing water and a compost tea bag of worm castings at roughly a 1% concentration and apply as a soil drench or a foliage spray using a handheld low-pressure sprayer. This is an incredibly economical way to use worm castings.

My Urban Worm Bag smells! Help!

A properly maintained worm bin should not smell bad. More than likely, the bin is over fed, too wet, or both.

Because the Urban Worm Bag has such good airflow, it is likely your bin has been overfed and the food is decomposing faster than the worms can consume it.

Remove any excess food, add bedding, and monitor conditions.

Urban Worm Bag Videos