Quick Answer
Weck 850ml Glass Jar – Features, Uses & Benefits is best understood by looking at the process rather than one fixed rule. This guide explains the key signs to watch, the variables that change the result and the practical next step for a home baker.
If you’re serious about baking, preserving, or fermenting, the Weck 850ml Glass Jar is one of the most reliable and versatile containers you can own.
Known for its German quality and timeless design, this jar has become a staple for sourdough bakers, jam makers, and home fermenters around the world. The Weck 850ml Glass Jar combines practicality, durability, and timeless style. Whether you’re nurturing a sourdough starter, storing dry goods, or preserving seasonal produce, it’s a tool you’ll keep reaching for.
In this post, we’ll cover the full list of features, benefits, and uses of the Weck 850ml jar — and why it deserves a place in your kitchen.
Key Features of the Weck 850ml Glass Jar
- Capacity: 850ml (28.7 fl oz) – perfect for starters, pickles, preserves, and dry goods.
- Material: High-quality, thick glass – durable, non-porous, and odour-free.
- Lid: Matching glass lid included – reusable and eco-friendly.
- Seal: Natural rubber ring creates an airtight closure when needed.
- Clasps: Two stainless steel clips secure the lid tightly in place.
- Wide mouth (100mm opening): Easy to fill, stir, and clean.
- Dimensions: 147mm height, 108mm diameter – compact yet spacious.
- Dishwasher safe: For hassle-free cleaning.
- Reusable: Designed to last for years, reducing waste.
Why It’s Perfect for Sourdough Starters
The Weck 850ml jar is a favourite among sourdough bakers. Here’s why:
- Clear glass walls make it easy to track growth, bubbles, and activity.
- Wide opening allows you to stir, feed, and maintain your starter without mess.
- Non-reactive glass means no unwanted flavours or chemical reactions.
- Easy cleaning reduces the risk of mould or contamination.
- Optional airflow: clasps can be left loose for natural fermentation, or sealed for airtight storage.
With enough room for starter expansion, but not so big that it’s wasteful, the 850ml size strikes the perfect balance.
Other Uses for the Weck 850ml Jar
This jar isn’t just for sourdough. Its versatility makes it useful in every kitchen:
- Pickling: The airtight seal keeps brine locked in for crisp cucumbers or pickled onions.
- Fermentation: Great for small-batch sauerkraut, kimchi, or kefir.
- Jams and chutneys: The classic preserving use — store homemade jams safely for months.
- Dry goods storage: Ideal for flour, grains, pasta, or coffee.
- Leftovers and fridge storage: No plastic, no staining, no odours.
- Serving: Attractive enough to use straight on the table for salads or desserts.
Sustainability Benefits
Choosing a Weck jar means choosing a sustainable alternative:
- 100% plastic-free – glass lid, rubber seal, and stainless steel clasps.
- Reusable again and again – unlike single-use jars or plastic tubs.
- Fully recyclable materials at the end of its long life.
Frequently Asked Questions About the Weck 850ml Glass Jar
1. Can I use the Weck 850ml jar for a sourdough starter?
Yes. The wide mouth makes it easy to feed and stir, and the clear glass lets you monitor activity. Many bakers prefer this size because it gives enough room for starter expansion without being oversized.
2. Are Weck jars airtight?
When used with the rubber seal and stainless steel clasps, the jar creates a secure airtight closure. You can also leave the clasps off if you want airflow during fermentation.
3. Can I use the Weck 850ml jar for pickling?
Absolutely. The airtight seal helps lock in brine and flavour, making it ideal for cucumbers, onions, and other pickled vegetables.
4. Are Weck jars safe for fermentation?
Yes. The non-porous glass won’t react with acidic foods, making it a safe choice for sauerkraut, kimchi, kefir, and kombucha.
5. Can I freeze food in a Weck jar?
Yes, but always leave enough headspace at the top (about 2–3 cm) to allow for expansion and prevent breakage.
6. Are Weck jars dishwasher safe?
Yes, the jar, glass lid, and clasps are dishwasher safe. The rubber seal can also be washed, but it’s best to remove it and wash gently to prolong its life.
7. What size is the Weck 850ml jar?
It measures approximately 147mm tall with a 100mm mouth opening and a diameter of about 108mm.
8. How long do the rubber seals last?
With proper care, the natural rubber seals can be reused many times. Replace them if they become cracked, brittle, or lose elasticity.
Starter Feeding
Before you buy
Buy for the job you repeat most often. Size, heat tolerance, ease of cleaning and how the tool fits your usual loaf matter more than owning the most specialist version. If something you already own performs the same job safely, use it first.