Welcome to Shake, Sip, Serve
Welcome to Shake, Sip, Serve, your one stop shop for all things bartending.
I’m your host, KAD, and if you’ve ever ordered an Old Fashioned, Negroni or whisky on the rocks, chances are it was served in a rocks glass.
Simple, sturdy and timeless, the rocks glass is one of the most recognisable pieces of glassware behind any bar.
While it may not have the elegance of a coupe glass or the height of a highball glass, it’s a workhorse that every bartender uses daily.
Understanding when and why to use a rocks glass is a fundamental bartending skill and one that every beginner should master.
Let’s take a closer look.
What Is A Rocks Glass?
A rocks glass is a short, wide glass designed for serving spirits over ice and spirit forward cocktails.
It is commonly known by several names:
- Rocks glass
- Old Fashioned glass
- Lowball glass
The wide opening allows room for:
- Large ice cubes
- Ice spheres
- Garnishes
- Spirit forward cocktails
Most rocks glasses hold between:
- 180ml
- 300ml
depending on the style and design.
Why Is It Called A Rocks Glass?
The name comes from the phrase:
“On the rocks.”
When a guest orders a drink on the rocks, they want it served over ice.
The rocks glass became the standard vessel for these drinks because it comfortably accommodates larger ice cubes while allowing easy sipping.
Over time, the name stuck.
What Does A Rocks Glass Look Like?
A traditional rocks glass is:
- Short
- Wide
- Heavy based
- Straight sided or slightly tapered
Most quality rocks glasses feature a thick base which provides stability and gives the glass a premium feel.
The heavy base also helps support large ice cubes without making the glass feel unbalanced.
Why Bartenders Love Rocks Glasses
The rocks glass remains a favourite because it’s incredibly versatile.
Perfect For Spirit Forward Cocktails
The shorter design suits cocktails where the spirit is the star.
Accommodates Large Ice Cubes
Large ice melts slower and provides better dilution control.
Durable
Most rocks glasses are built to handle busy hospitality environments.
Great Presentation
A large crystal clear ice cube in a quality rocks glass creates a premium look.
Rocks Glass vs Highball Glass
New bartenders often confuse these two glasses.
Rocks Glass
- Short
- Wide
- Spirit forward drinks
- Drinks served over ice
Highball Glass
- Tall
- Narrow
- Spirit and mixer drinks
- Carbonated beverages
As a general rule:
If the drink contains a large volume of mixer, use a highball.
If the drink focuses on the spirit, use a rocks glass.
Internal Link: Highball Glass Guide
Most Popular Cocktails Served In A Rocks Glass
Many of the world’s most famous cocktails are served in rocks glasses.
Old Fashioned
The cocktail that gave the glass one of its alternative names.
Ingredients
- Bourbon or whisky
- Sugar
- Bitters
Served over ice.
Internal Link: Whisky 101
Negroni
Ingredients
- Gin
- Campari
- Sweet Vermouth
Served over ice with an orange garnish.
Internal Link: Gin 101
Whiskey On The Rocks
One of the simplest serves.
Ingredients
- Whisky
- Ice
Sometimes simplicity is best.
Rum Old Fashioned
A modern variation of the classic.
Ingredients
- Aged rum
- Sugar
- Bitters
Internal Link: Rum 101
Boulevardier
Ingredients
- Bourbon
- Campari
- Sweet Vermouth
A richer cousin of the Negroni.
White Russian
Ingredients
- Vodka
- Coffee liqueur
- Cream
A classic rocks glass cocktail.
Internal Link: Vodka 101
Why Large Ice Cubes Work Best
One of the biggest trends in modern bartending is the use of large format ice.
Examples include:
- Large cubes
- Ice spheres
- Clear ice blocks
Why?
Because larger ice melts slower.
This means:
- Less dilution
- Longer lasting drinks
- Better presentation
Many premium cocktail bars now use specialised ice moulds specifically for rocks glass cocktails.
Double Rocks Glass vs Single Rocks Glass
There are two common styles.
Single Rocks Glass
Typically:
- 180ml to 240ml
Ideal for:
- Neat spirits
- Small cocktails
Double Rocks Glass
Typically:
- 300ml to 400ml
Ideal for:
- Cocktails served over ice
- Larger spirit pours
Many modern venues use double rocks glasses for flexibility.
Common Spirits Served In Rocks Glasses
The rocks glass is popular for:
Whisky
The most common choice.
Bourbon
Perfect with large ice cubes.
Rum
Particularly aged rums.
Tequila
Premium Reposado and Añejo expressions.
Cognac
Often served neat in a rocks glass.
Internal Links:
- Whisky 101
- Rum 101
- Tequila 101
Choosing Rocks Glasses For Your Home Bar
If you’re building a home bar, rocks glasses should be one of your first purchases.
Look for:
- Thick base
- Dishwasher safe construction
- Durable glass
- Comfortable weight
A quality set of rocks glasses can handle everything from cocktails to neat spirits.
Common Beginner Mistakes
Using Tiny Ice Cubes
Small ice melts quickly and waters down drinks.
Overfilling The Glass
Leave room for ice and garnishes.
Using A Rocks Glass For Every Cocktail
Different cocktails require different glassware.
Ignoring Presentation
A beautiful cocktail deserves appropriate glassware.
Essential Equipment For Rocks Glass Cocktails
Before we start mixing, make sure you have your cocktail kit ready to go. A proper shaker, jigger and strainer will make the process smoother and help you create a better balanced drink.
If you are still building your home bar, we recommend the Barillio cocktail kit here.
Now let’s shake up something great.
Essential tools include:
- Mixing glass
- Bar spoon
- Jigger
- Large ice moulds
- Rocks glasses
Internal Links:
- Complete Guide To Bartender Jiggers
- Bartender’s Guide To Glassware
- Barillio Cocktail Kit Review
Frequently Asked Questions
What is a rocks glass used for?
A rocks glass is used for spirits served over ice and spirit forward cocktails.
Is a rocks glass the same as an Old Fashioned glass?
Yes. The terms are often used interchangeably.
What cocktails are served in a rocks glass?
Popular examples include the Old Fashioned, Negroni, Boulevardier and White Russian.
What size is a rocks glass?
Most hold between 180ml and 300ml, although larger versions exist.
Why do bartenders use large ice cubes?
Large ice melts slower and provides better dilution control.
Final Thoughts
The rocks glass is one of the most versatile and important pieces of glassware behind any bar.
Its sturdy design, premium presentation and compatibility with spirit forward cocktails make it an essential tool for both professional bartenders and home enthusiasts.
Whether you’re serving a perfectly crafted Old Fashioned or enjoying a quality whisky over ice, the rocks glass remains a timeless classic.
Thanks for Joining Us Behind the Bar
The bartending community is a vibrant and supportive one, and I’m excited to build that community here on Shake, Sip, Serve. I’d love to hear your thoughts, questions, and experiences in the comments below. What are you shaking up these days? What topics would you like to see covered in future posts? Let’s connect and continue the conversation.
Liquor & Gaming NSW: This website provides information on liquor licensing, responsible service of alcohol (RSA) training, and regulations for serving alcohol in NSW. It’s essential for anyone working in the hospitality industry in NSW. You can find it here: Liquor & Gaming NSW.
If you’re looking to complete your RSA in any state or territory across Australia, you can find the full details here.