Boston Shaker
Two stainless steel tins, one slightly smaller than the other, that seal by being knocked together. No hinge, no gasket, no built-in strainer. That is why almost every professional bar uses one, and why it takes an afternoon to learn.
Essential Equipment
Recommended for every home bar
Alternatives
Budget Alternative
A wide-mouth mason jar with a tight-fitting lid (£3–5) can work for home use, though it lacks the thermal efficiency, balance, and durability required for professional service.
Premium Option
Koriko Weighted Shaking Tins (£35–40) are widely regarded as the industry standard. The 28oz/18oz pairing offers excellent balance, consistent sealing, and long-term durability under heavy service conditions.
Care & Maintenance
Care Instructions
- Rinse immediately after each use to remove citrus and sugar residue.
- Hand wash with mild detergent to preserve the finish.
- Dry thoroughly to prevent water spots and odour buildup.
- Store nested loosely to avoid tins sticking together.
Expected Lifespan
- •Premium tins: 10–15 years in professional use, lifetime in home settings.
- •Mid-range tins: 3–5 years with daily service.
- •Budget tins: 1–2 years before seal performance degrades.
Usage
Shaking anything with citrus, egg, cream or fruit in it. The large capacity suits a double build or a drink with a lot of ice, and the wide mouth empties and rinses in a second, which is most of why bars prefer it over anything with parts.
Two Tins and No Mechanism
The seal is not a fitting. It is metal deforming very slightly against metal, held by friction and then locked by physics.
Knock the small tin into the large one at an angle and the rims flex enough to grip. Then the drink inside chills the air trapped with it, that air contracts, and the pressure differential pulls the tins together harder than your hand ever could. The shaker gets tighter as it works.
That is why there is nothing to wear out. A cobbler shaker has a lid that loosens and a strainer that clogs; a Boston has two pieces of steel that will outlive the person shaking them.
Sealing and Breaking It
Seat the smaller tin at a slight angle rather than square, so one point of the rim sits proud. That offset is what you will hit later to open it.
To break the seal, hold the large tin in one hand and strike the offset point with the heel of the other: a firm tap, not a hammer blow. The rims flex, the pressure equalises and it comes apart. People who struggle with a Boston are almost always seating it square and then trying to pull it open by force.
If it genuinely will not shift, let it warm for thirty seconds. The same contraction that sealed it will release as the air inside warms.
Against the Cobbler
The cobbler is the better shaker for a beginner and the worse one for anyone making more than two drinks.
A cobbler seals without technique and strains without a separate tool, which is a real advantage the first few times. But the built-in strainer clogs with mint and pulp, the lid sticks as it cools, and the capacity is small enough that a double build overflows.
The Boston needs a Hawthorne strainer alongside it and a few minutes of practice. In exchange it is faster, holds more, never clogs, and comes apart in one motion. Every bar in the country has made this trade.
Weighted or Unweighted
A weighted set has a thicker base on the small tin, which adds heft and helps it sit still on the counter. Unweighted tins are lighter and stack more neatly.
The choice matters less than the sizes. The standard pairing is 28oz and 18oz, and those two are designed to seal against each other; mixing tins from different sets is the most common reason a shaker leaks.
Buy stainless steel and avoid anything coated or painted. The finish wears off exactly where the tins strike, which is the one place you do not want a rough edge.
Pro Tip
Instead of aggressive shaking, try a controlled rolling motion for 8–10 seconds when making Daiquiris. This Cuban technique produces a silkier texture while maintaining precise dilution.
What to Look For
- A tight, reliable seal that locks without visible gaps.
- Balanced weight that feels stable during vigorous shaking.
- Food-grade 18/8 stainless steel that resists corrosion and flavour retention.
- Rolled rims with no sharp edges to prevent cuts during service.
Common Mistakes to Avoid
- Over-shaking, which leads to excessive dilution and muted flavours.
- Filling above two-thirds capacity, reducing aeration and increasing leaks.
- Shaking carbonated ingredients, which can cause dangerous pressure build-up.
- Breaking the seal by striking the rim, leading to dents and seal failure.
Professional Tips
- Chill the tins first: a warm tin sticks harder when it cools.
- Seat the small tin at a slight angle, not square on.
- Break the seal with the heel of your hand at the offset point.
- Shake so the ice travels the long axis, not side to side.
Specifications
Material
Stainless steel
Capacity
Large tin: approximately 825ml (28oz) Small tin: approximately 530ml (18oz)
Details
Straight-sided tins with a slight taper, designed to create a friction seal when nested together.
History & Context
The Boston shaker emerged in mid-19th-century American bars as a practical alternative to ornate European cobbler shakers. Its two-piece construction eliminated moving parts and failure points, favouring speed and reliability over decoration. During Prohibition, similar tins were often disguised as juice mixers, reinforcing their association with discretion and function. That same emphasis on durability and efficiency keeps the Boston shaker at the centre of professional cocktail service today.
Common Questions
How do you seal and open a Boston shaker?
Seat the small tin at a slight angle so one point of the rim sits proud, and knock it home. To open, strike that proud point with the heel of your hand. Seating it square and then pulling is why people struggle with them.
Boston shaker or cobbler shaker?
Cobbler if you make the occasional drink and want no technique; Boston if you make several. The cobbler seals easily and strains itself but clogs and sticks. The Boston is faster, holds more and never jams, at the cost of an afternoon learning it.
Do I need a strainer with a Boston shaker?
Yes. A Boston is two open tins with no straining built in, so it needs a Hawthorne strainer over the mouth. That separation is a feature: the strainer never clogs the shaker, and you can swap in a fine mesh for double straining.
Should I buy weighted or unweighted tins?
Either. Weighted tins have a thicker base and sit more steadily; unweighted ones stack better. What matters far more is buying a matched 28oz and 18oz pair, since mixing tins from different sets is the usual reason a shaker leaks.