After regularly loosing luggage labels or the written contents inside, this is my suggestion for improvement.
It is not unlosable but attached with a cable tie it should withstand most things that happen to luggage.
It also makes your luggage easier to detect on the belt when printed in conspicious color.
Readability is good with the font sufficiently large and especially with backlighting (see image).
Customization is through the OpenSCAD-File and there are three principle options to choose from:
(1) Engraved text (as shown in the images)
(2) Engraved text as hollow area inside the label (aka hidden) (no image shown)
(3) Embossed (no image shown)
The size of the label is automatically adjusted depending on text length, number of lines and fontsize.
Hidden text can only be seen in backlight so is more "secure".
It needs write.scad:
2013-11-01; Changed name from Customizable to Parametric luggage label.
See also the new Customizer-version: http://www.thingiverse.com/thing:175150
It printed nicely with 1 shell, 3 bottom and top layers and 25% infill.
Do not make the fontsize to small otherwise letters will loose details at least when engraving.
With engraved text it can be printed upside down as well (text at bottom) if you prefer the later top side to be smooth; nice when printing on glass.