Sleeve sizing is arithmetic, and it goes wrong in one predictable place: people size the sleeve to the box instead of to the box plus clearance, and then it will not go on. Here is the calculation and the allowance.
The calculation
Measure the box width and the box depth, both on the outside. The sleeve wraps around those two dimensions, so its inside girth is two times the width plus two times the depth. To that you add clearance so it slides, and then a glue tab where the sleeve seams. Height is independent and is your design choice.
| Box width x depth | Girth, before clearance | Flat blank, plus glue tab |
|---|---|---|
| 4 x 2 in | 12 in | 12 in plus tab |
| 6 x 3 in | 18 in | 18 in plus tab |
| 8 x 2 in | 20 in | 20 in plus tab |
| 10 x 4 in | 28 in | 28 in plus tab |
| 12 x 3 in | 30 in | 30 in plus tab |
Clearance, the part that gets skipped
- Board has thickness, and the sleeve's own caliper eats into the opening. Thicker board needs more clearance.
- Laminated stock is slicker but also slightly thicker. Soft touch and textured finishes add drag as well as thickness.
- A rigid box with a wrapped lid is fractionally larger than its nominal size, and sleeves get specified against the nominal number.
- If the sleeve must hold firmly rather than slide freely, say so, because a display sleeve and a shipping sleeve want different tolerances.
Design support is included and will set the allowance on the dieline, and the digital proof shows the sleeve laid flat before it prints.
Sleeve height against box height
A full height sleeve covers the box and turns it into a printed surface. A partial height sleeve, often around a third to a half of the box height, works as a belly band and lets the box material show above and below it. Belly bands use the least board of any branded packaging and are the usual choice when you want to change the message often while keeping one box.
Where sleeves earn their place
- Seasonal or promotional versions of a product that otherwise uses one standard box.
- Plain or kraft boxes that need a full color face without printing the whole box.
- Two piece rigid boxes, where the sleeve holds the lid closed in transit.
- Multi-SKU ranges where one box size serves several products and the sleeve differentiates them.
- Retail sets where the sleeve carries the barcode and the compliance copy.
Minimum, price and turnaround
The minimum is 100 sleeves. Unit pricing starts at about $0.48 per unit at bulk volumes and is confirmed on your written quote, and sleeves usually price well because they use little board and no complex folding. Turnaround is stated per product in three lanes: Rush (expedited production plus air freight), Standard (air) and Cost saver (sea), with production from about 7 business days plus 2 to 5 days for delivery.
Get a sleeve quoted
Send the outside dimensions of the box the sleeve has to fit through the quote form. See also sleeve boxes for the full structure range and two piece boxes if the sleeve is holding a lid and base set closed.
