Finding the Right Sourdough Jar: Uncommon Alternatives

The journey of sourdough baking begins with a simple mixture of flour and water, evolving into a bubbly living entity known as the sourdough starter. Just as crucial as the ingredients and feeding routines, the container in which this starter resides plays a pivotal role in its health and vitality. So, what’s the best vessel for this fermentation marvel? Let’s explore.

The best jar for storing sourdough starter is a clear glass container with a wide opening and a loose lid, like a mason jar. It allows for easy monitoring of the starter’s activity, is non-reactive, and easy to clean. A jar with a wide opening makes feeding and stirring easy, while a breathable lid supports healthy fermentation.

What makes a good sourdough starter container?

An ideal sourdough starter container plays a significant role in the starter’s health and the quality of your bread. Let’s explore the essential features of a top-notch container:

1. Easy to Clean

A clean environment is pivotal for the healthy growth of your sourdough starter. A container that’s easy to clean ensures that remnants from previous batches don’t contaminate the new starter. Smooth interiors without nooks and crannies prevent dough buildup and make the cleaning process seamless.

2. Medium Size – 100g/16oz Jar

Size does matter. A medium-sized jar about 16oz that holds around 100g of culture is ideal. It’s large enough to allow the starter to expand, especially during those peak fermentation times, yet compact enough for easy storage.

3. Clear and Transparent

Observation is key in sourdough baking. A clear container offers a window into the starter’s world. You can easily monitor its activity, like bubble formation, volume expansion, and potential discolorations, ensuring you catch any issues before they escalate.

4. Wide Opening

Accessibility can’t be understated. A jar with a wide opening makes it simpler to feed, stir, and remove the starter. It also facilitates easy scraping of the sides, ensuring you keep the starter tidy and prevent dried dough from falling into your mixture.

5. Straight Side

A container with straight sides, as opposed to one that tapers, aids in monitoring the starter’s rise. It provides a uniform space for the starter to grow, making it easier to gauge if it has truly doubled in size—a critical indication of its readiness for baking.

6. Breathable Lids

Sourdough starters are living entities that need to breathe. A breathable lid ensures there’s adequate air circulation, which is crucial for the yeast and bacteria’s metabolic processes. While airtight lids might seem protective, they can stifle the starter’s growth and lead to off-flavors.

Exploring Different Jar Material Options

1. Glass Jars: The Transparent Choice

a. Visibility: 

One of the most significant advantages of using clear glass jars, such as mason jars, is the unobstructed visibility they offer. This transparency allows bakers to closely monitor the various stages of fermentation. Observing bubble formation, tracking the starter’s rise, and spotting any potential discolorations or mold becomes a breeze. 

b. Inert Nature

Unlike plastic or metal, glass is inert. This means it won’t react with the acidic environment of the sourdough starter. The result? Your starter remains uncontaminated, free from any potential leaching of unwanted flavors or chemicals. This non-reactive nature of glass ensures that the taste and quality of your sourdough remain pristine.

c. Ease of Cleaning

Their smooth surface makes cleaning hassle-free, reducing the chances of residue buildup. They can be easily sanitized using boiling water or by placing them in a hot oven for a few minutes, ensuring any lurking microbes are eradicated. 

2. Plastic Containers: Convenience with Caution

a. Durable 

One of the standout advantages of plastic containers is their lightweight nature. They’re easy to handle, especially for those who may find glass jars cumbersome. Additionally, for the accident-prone among us, plastic offers a breakage-resistant alternative, especially useful in bustling kitchens.

b. Food-Safe

If you’re leaning towards plastic, always prioritize safety. Opt for food-grade, BPA-free containers. Bisphenol A, or BPA, is a chemical found in some plastics that can leach into food, especially in acidic environments like that of a sourdough starter. By choosing BPA-free containers, you’re ensuring that your starter remains uncontaminated and safe for consumption.

c. Potential Downsides:

One of the inherent drawbacks of plastic is its susceptibility to scratches. Over time, as you stir, feed, and transfer your starter, the container’s interior can get scratched. These tiny grooves can become safe havens for unwanted bacteria or residues, potentially affecting the health and flavor of your sourdough starter.

3. Ceramic or Stoneware Crocks

a. Traditional Appeal 

Stoneware crocks aren’t just containers; they’re a testament to fermentation practices that have thrived for centuries. Their rustic charm can transport bakers back in time, adding a touch of vintage allure to the modern kitchen.

b. Breathable Lids

A significant advantage of many stoneware crocks is their breathable lids. Unlike airtight seals, these loose-fitting covers allow for the necessary gas exchange, vital for a thriving sourdough starter. This feature ensures that while the environment remains relatively closed, there’s enough ventilation for the starter to breathe and ferment efficiently.

c. Drawbacks

One of the drawbacks of ceramic or stoneware vessels is their opacity. Unlike clear glass or plastic containers, they don’t allow for easy observation of the starter’s internal activity. This can make it challenging for bakers to monitor bubble formation, volume expansion, or potential mold growth. Regular checks and transfers might be necessary to ensure the starter’s health.

While stoneware and ceramic containers add a classic touch, it’s crucial to ensure they’re safe for food storage. If the crock is glazed, always verify that the glazing is food-safe. Some older or decorative crocks may have glazes containing lead or other harmful compounds.

4. Stainless Steel: A Modern Option

a. Durability 

One of the standout attributes of stainless steel is its resilience. These containers can withstand a good deal of wear and tear without denting or breaking. For those who are frequently on the move or operate in high-traffic kitchens, stainless steel’s robustness can be a boon.

b. Non-reactive:

Sourdough starters are inherently acidic, which can cause reactions when in contact with certain metals, leading to unwanted flavors or even contamination. Unlike other metals, stainless steel won’t react with the acidic nature of sourdough starters. 

c. Visual Limitation: 

While stainless steel offers a host of benefits, it does come with its share of limitations, the most evident being its opaque nature. Bakers cannot visually monitor the starter’s progress, from bubble dynamics to potential mold growth. This means more frequent check-ins, possibly opening the container to ensure the starter’s health and vitality.


The home you provide for your sourdough starter can significantly impact its health and the final bread’s quality. Whether you lean towards the traditional charm of ceramic crocks, the clarity of glass, or the durability of stainless steel, the key lies in understanding the unique needs of the starter. With the right container, your sourdough starter will reward you with bubbles, vigor, and loaves that are a testament to your baking prowess.


Hey there! I'm Sam, your go-to pal for all things sourdough. I've been baking and kneading for 10 fun-filled years, and I can't wait to share the joy of turning simple ingredients into heavenly sourdough bread with you. Grab your apron and let's dive into this amazing world of sourdough bread together on this blog.

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