Muslin Bags for the Kitchen: Nut Milk, Cold Brew & Straining
Quick answer: Cotton muslin bags are one of the most versatile tools in the kitchen. Made from natural, unbleached 100% woven cotton, they're used to strain homemade nut milk, brew cold-brew coffee and loose-leaf tea, filter broths and yogurt, and hold herb sachets — then you rinse, dry, and reuse them for years.
If you've only ever thought of a muslin bag as gift packaging, its kitchen life will surprise you. The same breathable weave that makes cotton drawstring bags great for storage also makes them an excellent, plastic-free filter. Below is exactly what you can make with one, which size to reach for, and how to keep it food-ready.
What can you use a muslin bag for in the kitchen?
A muslin bag works anywhere you'd normally reach for cheesecloth or a disposable filter. The most common uses are:
- Nut and plant milks — almond, oat, cashew and coconut milk
- Cold brew coffee — steep grounds inside the bag, then lift it out
- Loose-leaf tea and herbal infusions — a reusable alternative to tea bags
- Straining broths, stocks, jellies and yogurt — a cheesecloth replacement
- Herb and spice sachets — bouquet garni, mulling spices, bath herbs
- Home brewing — hops and grain steeping bags
Because natural cotton can take boiling and long simmering, the same bag moves from cold nut milk to a hot stockpot without breaking down.
How do you make nut milk with a muslin bag?
It's a three-step process:
- Blend soaked nuts (or oats) with water until smooth.
- Pour the mixture into a muslin bag held over a bowl.
- Gather the top and squeeze — the smooth milk passes through the weave while the pulp stays behind.
For nut milk you want room to work, so a larger bag is best. Our 8"×10", 10"×12" and 12"×16" single drawstring bags all give you enough capacity for a full batch.
Cold brew coffee and loose-leaf tea
For cold brew, add coarse grounds to the bag, cinch the drawstring, and steep in cold water for 12–24 hours — then lift the whole bag out with zero sludge to filter. The same trick works for loose-leaf tea: drop leaves in and pour hot water over the top. A smaller bag such as our 4"×6" or 5"×7" single drawstring bag is ideal for single pitchers and repeat brewing.
A reusable cheesecloth alternative for broths, jellies and yogurt
Muslin's fine, even weave makes it a natural stand-in for cheesecloth. Use it to clarify stocks and broths, strain seeds from jams and jellies, or hang it to make thick strained (Greek-style) yogurt and soft cheeses. Unlike disposable cheesecloth, a cotton bag rinses clean and goes again — for a deeper comparison of weights and weaves, see our guide to muslin vs canvas vs calico fabrics and GSM.
What size and fabric muslin bag should you use?
Match the bag to the job:
- Tea, spices, small sachets: 3"×4" to 5"×7"
- Cold brew, single batches: 5"×7" to 8"×10"
- Nut milk and large-batch straining: 8"×10" and up
For kitchen filtering, a lighter single-layer weave strains fastest, so start with our single drawstring cotton bags. If you're unsure which dimension fits your recipe, our cotton bag size guide walks through every size we make, from 2"×3" up to 24"×34".
Are muslin bags food-safe, and how do you clean them?
Choose bags made from natural, unbleached 100% cotton with no dyes or coatings, and wash them before their first food use. To keep a bag food-ready:
- Rinse in hot water immediately after use, before residue dries.
- Machine wash on a gentle, cold cycle with a mild, unscented detergent — or hand wash.
- Air dry fully before storing; damp cotton can develop odor.
Cotton can shrink roughly 5–10% under high heat, so wash cold and skip the hot dryer to keep any shrinkage to a minimum.
Frequently asked questions
Can muslin bags be washed and reused?
Yes. Natural cotton muslin bags are washable and reusable hundreds of times. Rinse after each use, wash cold, and air dry to keep them clean and odor-free.
Do muslin bags shrink?
They can shrink about 5–10% if exposed to high heat in washing or drying. Washing in cold water and air drying keeps shrinkage to a minimum.
What size muslin bag is best for nut milk?
Use a larger bag — 8"×10", 10"×12" or 12"×16" — so there's room to pour a full blender batch and squeeze out the milk without overflowing.
Can you put a muslin bag in boiling water?
Yes. Natural, unbleached cotton withstands boiling and simmering, which is why muslin bags are used for hot broths, home brewing and herb sachets.
Is a muslin bag the same as a nut milk bag?
They do the same job. A dedicated nut milk bag often has a slightly finer mesh, but a fine-weave cotton muslin bag strains nut milk, cold brew and broths just as effectively and doubles for storage and packaging.
Get food-grade cotton muslin bags, factory-direct
Whether you're a home cook stocking up or a brand packaging tea, spices or nut-milk kits, BAGSGeek makes natural 100% woven cotton drawstring bags in every size from 2"×3" to 24"×34" — shipped direct from our own factory in bulk packs. Add your logo, or keep them plain and unbleached.
Shop cotton muslin drawstring bags →
Need a custom size or a printed run? Request a custom order and we'll quote it direct from the factory floor.