Lewis Bag & Mallet
A heavy canvas bag and a wooden mallet, for crushing ice by hitting it. The canvas is the clever part: it absorbs the meltwater as you work, so what comes out is dry crushed ice rather than slush.
Alternatives
Budget Alternative
A clean tea towel and rolling pin (£0–5) can be used in emergencies, though this method retains excess water and offers far less control over ice texture.
Premium Option
Professional-grade canvas Lewis bags with hardwood mallets (£35–45) provide better durability, water absorption, and consistency under regular service conditions.
Care & Maintenance
Care Instructions
- Empty and shake out the bag immediately after use.
- Rinse the interior with cold water if heavily soiled.
- Air dry completely before storage.
- Avoid machine washing, which weakens the fabric and seams.
Expected Lifespan
- •Premium canvas & hardwood: 10–15 years with proper drying and professional use
- •Standard canvas: 5–8 years before fabric softens or seams weaken
- •Budget fabric: 1–3 years before tearing, poor absorption, or odour issues
Usage
Crushing ice for Juleps, Swizzles, Cobblers, Tiki drinks and anything served over a packed dome. A bag of cubes takes about a minute of steady work and produces enough for two or three drinks at the right texture.
Why Canvas
Crushing ice releases water. The fracture surfaces melt on contact with warm air and with each other, and that water is what turns crushed ice into slush.
Untreated cotton canvas is absorbent enough to wick that meltwater away as it forms and strong enough to survive being hit repeatedly with a mallet. What is left in the bag is ice with dry surfaces, which packs into a dome and holds its shape in a glass instead of collapsing.
It is a piece of equipment with no moving parts and no substitute. A tea towel works and disintegrates; a plastic bag traps the water it is supposed to remove.
Against the Blender
A blender does crush ice, and it does it badly for this purpose.
Blades cut rather than fracture, so the result is a mix of powder and stubborn large lumps rather than an even gravel. Worse, the friction of the blades generates real heat, and the ice comes out already wet, which is the thing the bag exists to prevent.
There is also a texture argument that matters more than it sounds. Crushed ice from a bag has irregular faceted pieces that lock together into a solid dome; blender ice is rounded and slumps. A Julep built on blender ice is a different drink, and not a better one.
Getting an Even Crush
Use ice straight from the freezer, not ice that has sat on the counter. Cold hard ice fractures cleanly; tempered ice is already softening at the edges and smears.
Half-fill the bag, fold the opening over twice, and lay it flat on a solid surface: a chopping board on a counter, not the counter itself, unless you want to explain the dents.
Strike with the weight of the mallet rather than force. Ten or twelve firm blows, then feel the bag through the canvas and break up anything obviously large. Working the whole bag evenly matters more than hitting it hard.
The Drinks and the Care
The Mint Julep first, where the drink is built on a packed dome and the ice is structural rather than incidental. Then the Queen’s Park Swizzle and every other swizzle, where crushed ice is what makes the frost form on the glass.
Cobblers, the Mai Tai, most tiki, the Caipirinha and the Bramble all want it. So does anything you want to look frosted rather than merely cold.
Rinse the bag under cold water after every use and hang it up to dry completely. A damp canvas bag folded in a drawer goes musty within days, and the smell transfers straight into the ice.
Pro Tip
Good crushed ice is cold and dry. If it clumps, you’ve worked it too hard.
What to Look For
- Thick, tightly woven canvas that absorbs water effectively.
- Reinforced seams capable of withstanding repeated impact.
- A solid wooden mallet rather than rubber or metal.
- A bag size large enough to contain ice without splitting.
Common Mistakes to Avoid
- Using thin fabric bags that tear or fail to absorb water.
- Choosing rubber or metal mallets that shatter ice unevenly.
- Crushing ice too aggressively, producing slush instead of fragments.
- Storing the bag damp, leading to odour and mildew.
Professional Tips
- Fold the top over twice before you start, or ice escapes.
- Hit with weight, not speed. Let the mallet fall.
- Rinse the bag and hang it to dry, always.
- Use ice straight from the freezer. Tempered ice turns to slush.
Specifications
Material
Heavy canvas bag with wooden mallet
Capacity
Bag capacity: approximately 2–4kg of ice
Details
Thick woven canvas bag with open top or drawstring closure, paired with a solid hardwood mallet featuring a smooth cylindrical head.
History & Context
The Lewis bag dates back to the 19th century, when bartenders needed a way to produce crushed ice without mechanical tools. Its ability to absorb meltwater made it ideal for producing dry ice fragments, a characteristic still valued in classic cocktails today. Despite modern ice machines, the Lewis bag remains relevant for its control and simplicity.
Common Questions
What is a Lewis bag?
A heavy untreated canvas bag for crushing ice with a mallet. The canvas absorbs the meltwater as the ice fractures, so what comes out has dry surfaces and packs into a dome rather than slumping into slush.
Why not crush ice in a blender?
Blades cut rather than fracture, giving powder mixed with stubborn lumps, and the friction generates enough heat to wet the ice, which is exactly what the bag prevents. Blender ice is also rounded, so it slumps instead of locking into a dome.
How do you get even crushed ice?
Use ice straight from the freezer, half-fill the bag, fold the top over twice and lay it flat on a board. Ten or twelve blows with the weight of the mallet rather than force, working the whole bag evenly rather than hammering one spot.
What drinks need crushed ice?
The Mint Julep above all, where the packed dome is structural. Then swizzles, Cobblers, the Mai Tai, most tiki drinks, the Caipirinha and the Bramble. Anything meant to frost the glass rather than simply arrive cold.