Tools & Gear
The Best Containers for Sourdough Starter
Glass jar, plastic tub, or crock? Here's what to store your starter in, what size, and what to avoid.
The best container for sourdough starter is a clear glass jar (about 2–4 cups) with a loose-fitting lid, so you can see the rise, allow gases to escape, and clean it easily. Avoid sealing it airtight (pressure builds up) and avoid reactive metals.
What makes a good starter container
| Feature | Why |
|---|---|
| Clear | See the rise and bubbles |
| Straight sides | Easy to gauge the level |
| Loose lid | Lets CO2 escape |
| 2–4 cup size | Room to at least double |
| Easy to clean | Wide mouth |
Material options
| Material | Verdict |
|---|---|
| Glass | Best — clear, non-reactive, easy to clean |
| Food-safe plastic | Good — light, won't shatter |
| Ceramic crock | Fine, but you can't see the rise |
| Metal | Avoid reactive metals (aluminum); stainless is okay short-term |
Glass is the top choice because you can watch the rise and it doesn't react with the acidic starter. A wide-mouth jar is easiest to feed and clean.
Size matters
Choose a container with room for the starter to at least double without overflowing. For a typical 50–100g starter, a 2–4 cup jar is right. Too small and it climbs out; too large and it's hard to see the rise.
The lid question
Don't seal it airtight. Fermentation produces CO2, and a sealed jar can build pressure (and occasionally pop). Use a loose lid, a lid resting on top, or a cloth with a band. The starter needs to breathe.
Helpful extras
- A rubber band or marker to mark the starter's level at feeding time so you can track the rise.
- A second jar so you can feed into a clean jar and skip scrubbing dried starter.
Frequently asked questions
Can I use a mason jar?
Yes — a classic choice. Just don't screw the lid down tight; rest it on top or use a band with cloth.
What size jar for a small starter?
A 2-cup (16 oz) jar suits most home starters. Size up if you keep a larger amount.
Is plastic okay?
Food-safe plastic is fine and won't break. Glass is preferred for visibility and cleaning.
A clear container lets you read your starter at a glance. SourdoughAI complements that by tracking rise times so you know exactly when it's at peak.