Wraps & Liners

Beef Bung Casing

A large natural casing from beef intestine used to stuff big cured sausages like mortadella.

Beef bung is a wide natural casing made from the cecum of cattle, prized for large-format charcuterie. Sausage makers stuff it with mortadella, capocollo, and large salami because of its generous diameter and even curing surface. The natural membrane breathes during drying, helping the meat cure and develop flavor.

Beef bung casing is the cleaned membrane of a bovine cecum — the blind pouch where the small intestine meets the large — and it is the largest natural sausage casing still in regular use. A single bung runs roughly 18 to 36 inches (45–90 cm) long and stuffs out to 3 to 5 inches (7.5–12 cm) in diameter, far bigger than any pork casing. The wall is thin, almost pure collagen, and behaves like other natural casings: it breathes slightly during drying, takes smoke readily, and stays tender through long cooks.

That size is exactly why the category exists. The bung is the only natural casing that can hold a true whole mortadella, where one piece has to wrap 8 to 15 lb (3.5–7 kg) of finely emulsified meat studded with visible cubes of fat, and it does similar duty for wide-format salamis, whole-muscle cured hams that need a shaping vessel, and the walls of showpiece pâté en croûte. The membrane is edible, neutral in flavor, and peels away cleanly once the sausage is fully cooked and thoroughly chilled.

Beef bung is a specialty purchase rather than a household staple. Most casings are processed in South America, Germany, Italy, or New Zealand, packed in heavy salt, and graded by caliber and cleanliness. Because the yield per animal is low — one cecum per cow — the price sits at the top of the natural-casing market. Charcuterie makers and small production butchers are the typical buyers.

Alternatives

Hog CasingFibrous CasingCollagen Casing

Types & varieties

Beef bung (cecum)

The classic: the cecal pouch itself, the longest and widest section. Preferred for whole mortadella and similar showpiece sausages.

Beef round (colon section)

Often grouped with bungs. A straighter tube, used where a long uniform cylinder is needed rather than a rounded end.

Imported vs domestic

Most commercial bungs are imported (South America, Germany, Italy, New Zealand); grading is by caliber and cleanliness.

Pre-tied / pre-carded

Some suppliers sell bungs already tied at one end and clipped to a hanging string (on a 'card'), saving a step.

Sizing up: when a beef bung is the right call

Casings come in a rough size hierarchy, and the bung sits firmly at the top. The point of choosing one is almost always the combination of size and the qualities of a natural wall — edible, breathable, peelable, and able to take smoke. If any of those qualities can be sacrificed, fibrous casings reach similar diameters and are easier to source, but they are stripped off before slicing, so they are a different tool rather than a like-for-like swap.

Sheep casings: under 1.5 in (3.8 cm) — merguez, chipolata, breakfast links
Hog middles: 1.5–2 in (4–5 cm) — most fresh sausages and smaller salamis
Beef middles: 2–2.5 in (5–6 cm) — large salami, soppressata
Edible collagen: 2.5–3.5 in (6–9 cm) — uniform and edible, but no breathability
Fibrous casings: 3–5+ in (7.5–13 cm) — inedible, hold shape under heavy weights
Beef bungs: 3–5 in (7.5–12 cm) — the natural-casing ceiling: edible, peelable, breathable

Common uses

Whole mortadella — the canonical Italian application, 8–15 lb per pieceLarge-format salami and soppressata where a wide diameter is desiredCapocollo or coppa stuffed whole in its casing for shape and presentationWhole-muscle cured hams shaped and held in a casing during the cureSpecialty boudin blanc or boudin noir in large formatShowpiece pâté en croûte interiors where a thick natural wall is wantedAny application needing a single casing longer and wider than pork middles can supply

Tips & pitfalls

Soak longer than you think: 30–60 minutes in cool water with several rinses, so the salt is fully drawn out and the casing is pliable.
Flush the inside of the casing under running water; residual salt pockets will make the finished sausage taste harsh and uneven.
Slip the casing onto the stuffing horn wet — water is your lubricant. Never force a dry bung; it will tear.
Tie or clip the far end first, fill, then tie the near end. Leave a little slack, because the casing shrinks during cooking and chilling.
Prick any visible air pockets with a sterilized pin before cooking. Trapped air expands and bursts the casing.
Don't overstuff — the wall is strong but the tied ends are the weak point. Cap them with butcher's twine or metal clips designed for the purpose.
Cook gently: large bungs heat unevenly, so use a water bath or poach at 170–180°F (76–82°C) until the center reaches target, rather than a hot oven.
Chill thoroughly (preferably overnight, weighted) before peeling. The casing releases cleanly only when the fat and meat have fully set.
If the casing smells sour or ammoniated after soaking, discard it — that signals spoilage from an old or poorly salted pack.

Good to know

Source: Bovine cecum — the blind pouch at the junction of the small and large intestine
Material: Cleaned natural intestinal membrane, almost pure collagen
Form sold: Salt-cured and packed in heavy salt, or dried/rind-cured; never sold fresh
Typical length: 18–36 inches (45–90 cm) per casing
Stuffed diameter: 3–5 inches (7.5–12 cm); the largest commonly available natural sausage casing
Pre-use prep: Rinse off salt, soak 30–60 minutes in cool water, flush the lumen under running water
Edibility: Edible and tender; peels away cleanly once the sausage is fully cooked and chilled
Reusability: Single-use; the casing is discarded (or peeled off) after cooking
Shelf life: Indefinite in heavy salt pack under refrigeration; dried casings keep for months in a cool pantry
Cost tier: Premium among natural casings, since yield per animal is just one cecum per cow