{"product_id":"glass-demijohn-small-batch-fermentation-bottle","title":"4L Glass Demijohn (Mandfles) - Small-Batch Fermentation Bottle for Mead, Cider \u0026 Wine","description":"\u003cp\u003eThe 4-litre glass demijohn is the small-batch brewer's favourite vessel — known to Dutch brewers as the mandfles or gistfles, the classic fermentation bottle that has carried homemade wine, cider and mead through kitchens for generations, and that modern brewers have rediscovered as the perfect experimentation format. Four litres is exactly the size where fermentation becomes playful: small enough that a failed experiment costs almost nothing, big enough that a success fills a shelf of bottles.\u003c\/p\u003e\u003cp\u003eThat experimentation angle is where a demijohn earns its shelf. Split a single 20-litre brew across several demijohns and ferment each on a different yeast — the same wort on a kveik, an abbey strain and a clean ale yeast, side by side, is the fastest brewing education money can buy. The same goes for dry-hop trials, fruit additions and oak experiments: one base beer, five variables, five demijohns of answers. Beyond beer, this is the natural home of the small-batch mead, the autumn cider pressing, country wines and kombucha — and an ideal secondary vessel for clearing or ageing a small batch under airlock. Glass is the material brewers trust for long ferments: flavour-neutral, effectively oxygen-tight, easy to sanitise completely, and unlike plastic it doesn’t scratch easily into places where bacteria can hide.\u003c\/p\u003e\u003cp\u003eChoose your style: the classic \u003cstrong\u003edame-jeanne\u003c\/strong\u003e with its smooth cork-finish neck — available bottle-only or ferment-ready with drilled silicone bung and airlock included — or the \u003cstrong\u003escrew-neck jug\u003c\/strong\u003e, the straight-sided workhorse with a threaded mouth. Practical notes from the small-batch trenches: keep clear glass out of direct light — ferment somewhere dark or drape a towel over it to protect hops and wine from light damage. The carry lug at the neck is for an empty bottle only; a full demijohn gets carried with two hands under the base, always. Fill to the shoulder for ferments with a krausen, leaving headspace for the show.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eClassic 4-litre clear glass demijohn — the small-batch standard\u003c\/li\u003e\n\u003cli\u003eTwo styles: traditional dame-jeanne (cork neck) or straight screw-neck jug\u003c\/li\u003e\n\u003cli\u003eFerment-ready option: dame-jeanne with drilled bung and airlock included\u003c\/li\u003e\n\u003cli\u003ePerfect split-batch experiment vessel: one brew day, multiple yeast or hop trials\u003c\/li\u003e\n\u003cli\u003eFlavour-neutral glass that’s easy to clean and sanitise\u003c\/li\u003e\n\u003cli\u003eA finished batch fills roughly a dozen 33cl bottles — minus the yeast’s share\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eUsage\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eFerments:\u003c\/strong\u003e mead, cider, country wine, kombucha, small-batch beer, split-batch experiments, fruit and oak trials\u003cbr\u003e\u003cstrong\u003eSecondary:\u003c\/strong\u003e clearing, ageing and bulk-conditioning small batches under airlock\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e the dame-jeanne takes a standard drilled bung and airlock (included in the kit variant). Keep out of direct light. Carry lug is for an empty bottle only. Sanitise like any fermenter before use.\u003c\/p\u003e\u003ch3\u003eQuick facts\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e CraftBrew\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e glass demijohn \/ fermentation bottle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e 4 litres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso known as:\u003c\/strong\u003e mandfles, gistfles, gistingsfles, dame-jeanne\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e clear glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyles:\u003c\/strong\u003e dame-jeanne (cork neck) or screw-neck jug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit option:\u003c\/strong\u003e dame-jeanne with drilled silicone bung \u0026amp; airlock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse:\u003c\/strong\u003e small-batch fermentation, split-batch experiments, mead, cider, wine, kombucha, secondary\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eRelated products\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/craftbrew.nl\/products\/airlock-s-shape\"\u003e\u003cstrong\u003eAirlock — S Shape\u003c\/strong\u003e\u003c\/a\u003e — the demijohn’s standard companion; fit it through a drilled bung and fermentation is sealed\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/craftbrew.nl\/products\/silicone-bung-26x32mm-with-9mm-hole\"\u003e\u003cstrong\u003eSilicone Bung 26\/32 mm with 9 mm Hole\u003c\/strong\u003e\u003c\/a\u003e — drilled for an airlock stem; check it against your bottle’s neck diameter\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/craftbrew.nl\/products\/auto-siphon-mini-1-5m-tubing-9-13mm-small-batch-racking-siphon-kit\"\u003e\u003cstrong\u003eAuto-Siphon Mini + 1.5m Tubing\u003c\/strong\u003e\u003c\/a\u003e — the small-batch racking kit: transfers your finished small batch off the sediment\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/craftbrew.nl\/products\/kveik-yeastery-k-1-voss-organic\"\u003e\u003cstrong\u003eKveik Yeastery K.1 Voss Organic 7g\u003c\/strong\u003e\u003c\/a\u003e — the split-batch experiment strain: fast, hot and forgiving in small trials\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/craftbrew.nl\/products\/vinoferm-glucose-1kg-dextrose-priming-brewing-sugar\"\u003e\u003cstrong\u003eVinoferm Glucose 1kg\u003c\/strong\u003e\u003c\/a\u003e — chaptalise a thin cider or prime the finished batch for bottling\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- INTERNAL - copy these into the admin fields, then this comment can stay (invisible to customers) or be deleted.\nHS Code (all variants): 701090  [researched: CN 7010 90, glass carboys\/bottles \u003e= 2.5 L; confirm vs Brouwland's commodity code]\nCountry of origin: PENDING - read the maker's mark on the bottle base; common origins for this bottle style: BG \/ PL \/ IT \/ ES\nSearch boosts (10 separate terms):\ndemijohn\nmandfles\ngistfles\ngistingsfles\nglazen gistfles 4 liter\ndame jeanne\nglass carboy\nmead fermenter\ncider fermenter\nkleine gistfles\n--\u003e","brand":"CraftBrew","offers":[{"title":"Dame-jeanne (cork neck) - bottle only","offer_id":57538124579191,"sku":"CB-DEMI-4L-DAMA","price":7.9,"currency_code":"EUR","in_stock":true},{"title":"Dame-jeanne - with bung \u0026 airlock","offer_id":57538124611959,"sku":"CB-DEMI-4L-DAMA-KIT","price":9.9,"currency_code":"EUR","in_stock":true},{"title":"Screw-neck jug - bottle only","offer_id":57538124644727,"sku":"CB-DEMI-4L-SCREW","price":7.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0932\/6578\/9303\/files\/dj_1_hand_555ef97b-954c-48e0-ba3a-ffb2fbfa3ca1.webp?v=1791591512","url":"https:\/\/craftbrew.nl\/products\/glass-demijohn-small-batch-fermentation-bottle","provider":"CraftBrew","version":"1.0","type":"link"}