WECK 850 ml Inverted Jar RR100
The WECK 850 ml Inverted Jar RR100 is ideal for larger sourdough starter builds and high-activity fermentation. The wide 100 mm round rim opening allows easy feeding, mixing and cleaning, and the extra height leaves room for the starter to rise.
Recommended for larger sourdough starter builds and high-volume baking.
Made from durable German glass, this jar gives clear visibility to monitor fermentation activity and dough rise.
Compatible with WECK RR100 glass lids, rubber sealing rings and stainless steel clips (sold separately).
- Extra capacity for an active starter
- Wide opening for easy feeding
- Clear glass so you can see the fermentation
For a secure fit you will need:
- 1 x RR100 Glass Lid
- 1 x RR100 Rubber Sealing Ring
- 2 x Stainless Steel Clips
Specifications
Country
Germany
Material
Clear glass
Volume
850 ml
Full brim volume
850 ml
Diameter (outside)
100 mm
Height
147 mm
Weight
375 g
Base shape
Round
Manufacturer
Weck glass and packaging GmbH, Alter Heerweg 2, 53123 Bonn
Order by 2pm Monday to Friday and your order is dispatched the same day.
- Free UK delivery on orders over £50.
- Standard UK delivery: 1-2 working days.
- You will receive tracking by email as soon as your order is dispatched.
30-day returns. You have 30 days from receiving your item to request a return. Items must be unused, with tags, and in the original packaging.
- Approved refunds are issued to your original payment method within 10 business days.
- Return postage is paid by the customer unless the item is faulty or we sent the wrong item.
- Starter cultures, perishable goods, custom items, gift cards and sale items cannot be returned.
- To start a return, email support@sourdoughsupply.co.uk. Returns sent without approval cannot be accepted.
Why bakers keep their starter in a WECK jar
Growing your starter: lid resting on top
While your starter is active, it needs to breathe. Rest the glass lid on top without the seal, and gas escapes as it rises while dust and kitchen smells stay out. Through the clear glass you can see exactly how far it has risen and when it's ready to bake with.
In the fridge: seal and clips on
Between bakes, add the rubber seal and the two steel clips. The jar closes tight, so your starter can sit in the fridge and be fed once a week instead of every day, without drying out or picking up smells.
One jar, both jobs
Glass doesn't react with your starter, the wide mouth makes stirring and scraping out easy, and the jar and lid go in the dishwasher. Genuine WECK glass, made in Germany since 1900.
Buying the jar only? The seal and clips turn it into a fridge jar whenever you need one.
Everything that goes with it
- 850 ml Inverted Jar RR100 £8.49
- Glass lid RR100 £1.99
- Rubber ring RR100 £0.99
- Clips, pair £0.99
Which one do I need?
Match the opening first, RR60, RR80 or RR100, then pick the capacity. Everything with the same opening fits together.
- Opening
- RR100, 100mm
- Capacity
- 850ml
- Shape
- Inverted
- Best for
- The jar for larger starters
- Needs
- RR100 lid, RR100 ring, 2 clips
580ml inverted
- Opening
- RR100, 100mm
- Capacity
- 580ml
- Shape
- Inverted
- Best for
- The everyday starter jar
- Needs
- RR100 lid, RR100 ring, 2 clips
1000ml inverted
- Opening
- RR100, 100mm
- Capacity
- 1000ml
- Shape
- Inverted
- Best for
- A large starter, or storing flour
- Needs
- RR100 lid, RR100 ring, 2 clips
1050ml tulip
- Opening
- RR100, 100mm
- Capacity
- 1050ml
- Shape
- Tulip
- Best for
- A large starter with room to climb
- Needs
- RR100 lid, RR100 ring, 2 clips
Tested in our kitchen
Every tool earns its place by baking with it first. If it does not, we do not stock it.
Posted same day
Order by 2pm Monday to Friday and it leaves our UK warehouse that day.
30-day returns
Unused and in its packaging, send it back within 30 days for a refund.
Real people on email
Stuck with a bake or a basket? Ask us. A baker replies, not a bot.
Chosen by bakers, for bakers
Sourdough Supply Co. is a small UK team of home bakers. Everything we stock is used in our own kitchens before it goes on the site, and if a tool does not earn its place, we do not sell it. Questions about your bake? Email us and a real person will reply.
Frequently asked questions
The things people ask us before they buy, and the things they ask after.
Read the guidesLid loose or clipped on?
Why not just seal it airtight?
What size jar do I need?
Which lid and seal fit my jar?
Dishwasher safe?
Pairs well with
