What size tumbler box do I need?
Short answer: Measure the widest lid rim, any protruding side handle, the narrow bottom base, and the full length of the reusable straw. A 20 oz skinny tumbler fits a 3.125 × 3.125 × 8.625 inch (diagonal straw) or 3.25 × 3.25 × 9.75 inch (upright straw) custom tumbler boxes setup.

On this page
- How do I measure a tumbler, lid, side handle and straw for a custom box
- What are standard tumbler box dimensions for 12 oz, 16 oz, 20 oz, 30 oz and 40 oz cups
- How do I size boxes for 20 oz skinny sublimation tumblers and 16 oz glass cans
- How do I size boxes and base inserts for 30 oz and 40 oz handle travel tumblers
- How do I calculate dimensions for 2-pack tumbler sets and corporate welcome kits
- Common mistakes
- FAQs
Request a custom quoteFree dieline & 3D mockup
Sizing a tumbler box requires measuring three parts that standard mug charts ignore: the reusable straw length, the side-handle span on large travel quenchers, and the difference between the wide top lid rim and the narrow cup-holder base. A standard 20 oz straight skinny tumbler measures roughly 2.9 inches wide by 8.25 inches tall, so it fits a 3.125 × 3.125 × 8.625 inch carton when its 9.5 inch straw is placed diagonally corner-to-corner, or a 3.25 × 3.25 × 9.75 inch carton when the straw stands upright in a dedicated corner slot. For a 40 oz insulated handle tumbler (which spans 5.5 to 5.875 inches across the handle and ships with a 12 inch straw), the inside dimensions step up to 6.0 × 4.25 × 11.25 inches. At CubitPack, every box and insert is cut to your exact inside dimensions with no die fees and free US shipping.
How do I measure a tumbler, lid, side handle and straw for a custom box?
The number-one sizing mistake in drinkware packaging is measuring the stainless steel or glass cup body alone while forgetting the straw and the side handle. A 20 oz skinny tumbler stands 8.125 to 8.25 inches tall with its slider lid installed, but the reusable plastic or stainless steel straw included with it is 9.5 inches long. Similarly, a 40 oz travel quencher has a 3.9 inch lid diameter, but its bolt-on ergonomic side handle extends another 1.75 inches out to the side. Before ordering custom printed tumbler cartons, set your assembled tumbler, lid and straw on a flat table and record five measurements: the top lid diameter, the bottom cup-holder base diameter, the total width across any side handle, the cup height with the lid snapped on, and the total length of the straw and cleaning brush.
- Top rim diameter: measure across the widest part of the lid or upper cup rim and add 1/4 in (0.25 in) for smooth loading.
- Total width with handle (40 oz quenchers): measure from the outer edge of the handle to the opposite rim and add 1/4 to 3/8 in.
- Bottom base diameter (tapered cups): measure the narrow cup-holder foot so our design team can size the stepped bottom ring.
- Upright straw box height: add 1/4 in to the full length of the straw (e.g., 9.5 in straw = 9.75 in box height; 12 in straw = 12.25 in or angled 11.25 in).
- Diagonal straw box height: use the Pythagorean diagonal across the square base to fit a 9.5 in straw inside an 8.625 in tall box.
What are standard tumbler box dimensions for 12 oz, 16 oz, 20 oz, 30 oz and 40 oz cups?
While CubitPack cuts every order to your exact vessel and straw measurements with zero cutting die charges, almost all insulated stainless steel, sublimation and borosilicate glass tumblers fall into seven industry-standard sizes. Use the table below to compare compact diagonal-straw sizes against upright straw-slot and handle-ready sizes. Notice how the 20 oz skinny sublimation tumbler is listed in two heights: an 8.625 inch height where the straw rests diagonally across the box, and a 9.75 inch height that houses a vertical corner straw channel so the straw stays hidden behind the front window frame.
| Tumbler type & capacity | Typical inside size (L × W × H) | Recommended box & insert setup |
|---|---|---|
| 12 oz stemless insulated wine or rocks tumbler | 3.75 × 3.75 × 5.0 in | Straight tuck end or window box |
| 16 oz glass beer can tumbler + bamboo lid + straw | 3.625 × 3.625 × 8.5 in | E-flute carton + 2-cell glass straw divider |
| 20 oz straight skinny tumbler (diagonal 9.5 in straw) | 3.125 × 3.125 × 8.625 in | Window auto lock bottom carton |
| 20 oz skinny tumbler + upright 9.5 in straw slot | 3.25 × 3.25 × 9.75 in | Window auto lock + corner straw channel |
| 30 oz tapered stainless travel tumbler + straw | 4.25 × 4.25 × 9.75 in | Auto lock bottom + stepped base ring |
| 40 oz side-handle travel quencher + 12 in straw | 6.0 × 4.25 × 11.25 in | E-flute corrugated box + base & handle lock |
| Two-tumbler gift set (two 20 oz skinny tumblers) | 8.5 × 9.5 × 4.25 in | Magnetic rigid box or E-flute mailer + foam |
How do I size boxes for 20 oz skinny sublimation tumblers and 16 oz glass cans?
Straight-walled 20 oz skinny stainless steel tumblers and 16 oz borosilicate glass beer can tumblers are the two best-selling blanks for custom sublimation, UV-DTF wraps and laser engraving. Because a 20 oz skinny tumbler has a uniform 2.875 to 2.95 inch diameter from top to bottom, it slides cleanly into a 3.125 inch or 3.25 inch square window box. If you add a folded corner straw channel to hold a stainless steel straw and wire cleaning brush upright behind the front window pillar, use 3.25 × 3.25 × 9.75 inches so the 2.95 inch tumbler still has clearance beside the corner post. For a 16 oz borosilicate glass can tumbler (typically 3.0 inches wide by 5.75 inches tall with a bamboo lid and an 8.0 inch bent glass straw), never pack the fragile glass straw loose inside the same chamber as the glass cup. Size an E-flute corrugated box at 3.625 × 3.625 × 8.5 inches so there is a dedicated 1/2 inch fluted partition lane isolating the glass straw from the glass can.

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Request a Quote →How do I size boxes and base inserts for 30 oz and 40 oz handle travel tumblers?
Large 30 oz and 40 oz vacuum-insulated travel tumblers present two unique structural challenges: they are sharply stepped (narrow 2.8 to 3.0 inch base at the bottom, wide 3.9 inch body at the top), and 40 oz quenchers have a wide side handle that shifts the center of gravity off-axis. If you place a 40 oz handle tumbler inside a plain 6.0 × 4.25 × 11.25 inch rectangular box without an internal base insert, the narrow 3.0 inch bottom foot slides sideways into the empty space under the handle, causing the heavy tumbler to tilt at a 25-degree angle. To lock a 30 oz or 40 oz tumbler upright, our structural team builds a die-cut stepped bottom cradle (cardboard insert) that sits 1.5 inches above the floor with a 3.05 inch circular cutout offset to match the cup-holder base. We then pair that lower ring with an upper neck collar that grips the 3.9 inch body just above the top handle bracket while holding the 12 inch straw in a corner slot.

How do I calculate dimensions for 2-pack tumbler sets and corporate welcome kits?
Bridal party boxes, winery gift sets, golf tournament prizes and corporate employee onboarding kits often bundle two tumblers together - or pair one 20 oz or 30 oz insulated tumbler alongside a bag of coffee, a notebook and a metal straw kit. For multi-item drinkware sets, laying the tumblers horizontally inside a magnetic closure box, two-piece box or corrugated mailer box creates a wide, dramatic unboxing reveal. To size a horizontal two-tumbler gift box with a custom-routed EVA foam insert, add the diameters of both tumblers (for example, 3.0 in + 3.0 in = 6.0 in), add 0.75 inches of foam between the two cavities and 0.875 inches of foam around the left and right outer walls (total width 8.5 inches). Then take the tumbler height (8.25 in) or straw length (9.5 in) and add 0.75 inches at the top and bottom to reach an 8.5 × 10.5 × 4.0 inch inside box size.
What are the most common tumbler box sizing mistakes?
Crushed lids, bent straws and tilted 40 oz quenchers almost always come from measuring the cup body alone. Check these five details before approving your dieline
- Sizing a 20 oz skinny tumbler box to 8.375 inches tall and discovering on packing day that the 9.5 inch upright straw sticks out of the top.
- Measuring a 40 oz travel tumbler across its 3.9 inch round lid while forgetting the extra 1.75 inches of width required by the side handle.
- Placing a tapered 30 oz or 40 oz cup-holder tumbler in a wide box without a stepped bottom ring, allowing the narrow base foot to kick out.
- Packing a 16 oz glass can tumbler with its glass straw loose inside the same compartment, causing the straw to snap during shipping.
- Adding an internal corner straw divider to a tight 3.0 inch square box without expanding the width to 3.25 inches for divider clearance.
Find your size
Suggested inside size: 3.75 × 3.75 × 5 in
A starting point. Your account manager confirms the size with you before the proof.
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Request a Quote →Questions about tumbler boxes
Are custom tumbler box dimensions quoted as inside or outside measurements?
All CubitPack tumbler box dimensions are quoted as usable inside measurements in the order of Length × Width × Height in inches. Quoting by inside dimensions guarantees your tumbler rim, side handle, lid and straw insert fit without pinching. Every order includes a free digital proof, 3D mockup, no die or plate charges, and free delivery to all 50 US states with a 5-7-minute quote response.
How do I fit a 9.5 inch straw inside an 8.625 inch tall 20 oz tumbler box?
In a 3.125 × 3.125 × 8.625 inch square carton, the internal 3D diagonal from the bottom-front-left corner to the top-back-right corner is 9.69 inches. Placing the wrapped 9.5 inch straw diagonally across the corner lets you use a shorter, lower-cost carton.
What size box fits a 12 oz insulated stemless wine tumbler?
A standard 12 oz egg-shaped stainless steel stemless wine tumbler measures roughly 3.5 inches at its widest belly and 4.5 to 4.75 inches tall with its press-in lid. A 3.75 × 3.75 × 5.0 inch straight tuck or window box gives a clean retail fit.
What size box fits a 30 oz tapered stainless steel travel tumbler?
A 30 oz tapered travel tumbler typically measures 4.0 inches across the top rim, 2.75 inches across the bottom cup-holder base, and 8.0 inches tall (plus a 9.5 or 10 inch straw). Use 4.25 × 4.25 × 8.75 inches (diagonal straw) or 4.25 × 4.25 × 9.75 inches (upright straw) with a bottom base ring.
Does CubitPack charge extra die fees for custom straw slots or stepped base inserts?
No. CubitPack never charges cutting die or printing plate fees. Whether your box includes a vertical front window, an internal corner straw channel or a stepped base ring for a 40 oz quencher, we cut the exact dieline at zero tooling cost.
Can I test my tumbler, handle and straw in a physical sample box before the full run?
Yes. Every order includes a free 2D dieline proof and 3D mockup before payment, and you can also order a paid physical prototype sample cut to your exact tumbler, handle and straw dimensions (with its cost credited to your full order) or our $50 sample kit.
Still have a question? Ask a packaging specialist.
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The inside dimensions in this guide were calculated from standard 12 oz wine tumblers, 16 oz borosilicate glass cans, 20 oz straight skinny sublimation blanks, 30 oz tapered cups and 40 oz side-handle quenchers, plus 9.5 in and 12 in straw allowances. A CubitPack packaging specialist verified every row. Spot an error? Tell us and we will fix it.
Sources
What changed
- October 22, 2026: First published.
- October 22, 2026: Updated specifications, terminology, and verified source links.
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