The Tray Is the Starting Point
The most important dimension in Custom Eyelash Boxes is usually the tray, not the lashes alone. Strip lashes may be light, but their presentation depends on a shallow carrier that keeps the pair shaped, separated and facing forward. The outer carton should hold that carrier securely without pressing on the fibres or making a small product disappear inside excess depth.
Start with the finished tray or insert exactly as it will be packed. Its outside length, width and depth set the usable cavity. Any finger notch, raised rim, lid, pull tab or other projection also needs clearance. This keeps the carton specific to the product while custom cosmetic packaging can stay visually coordinated across the brand.
Measure the Carrier
Measuring only the lash pair can produce the wrong box. Two lash styles may use similar fibres but sit on different tray shapes or depths. Measure the complete carrier at its widest and deepest points, then allow enough working clearance for packing and removal.
A close fit is useful, but friction should not make staff flex the tray to load it. If the tray bows as it enters the carton, the cavity is too tight or the entry path needs changing.
Preserve the Lash Arc
The top of the pack should clear the highest point of the lashes without creating a deep empty cavity. Fuller styles can rise noticeably above the tray, so usable internal height should be checked with the lashes already seated.
Keep the tray stable from its edges or underside rather than asking the fibres to tolerate contact. That preserves the intended curve and keeps the first view consistent.











