I use a Brother D400 Label for most 1-3 line labels as shown above for the postal card catalog number (and avoid the reverse toner cost). For labels on On Vario pages, you have to experiment with the various 3rd party label manufacturers if you care about being able to cleanly remove the labels. I notice that some of the cheaper 3rd party labels are more likely to leave adhesive residue. This comes off with a bit or work but buying a better quality label will save you time if you frequently remove/move labels.
I also use the same transparently labels in a number of other applications including binders as shown here in transparent gold color.