A good label answers two questions: what material is in the bag, and where was it taken from? You do not need to include an order number or a printed order confirmation with the package.
Describe the material clearly
Use an everyday name that you will recognise later yourself. "Tile, grout and tile adhesive", "vinyl flooring with adhesive" or "wall filler" is more useful than a vague "sample 1". If you do not know the technical name of the material, a short description is enough.
Give the exact location
"Bathroom" alone can be too general if both the floor and a wall in the same room are being tested. Better labels are, for example:
- Bathroom, wall by the shower, tile with the layers underneath
- Kitchen, wall behind the sink, filler
- Bedroom, floor, brown vinyl flooring with adhesive
Use the same name in the order and on the bag
If the sample name in the online order matches the location and material, the result is easy to match to the right spot. If you send several bags, you can also number them 1, 2 and 3. The number does not replace the material and the location, though.
Do not put loose notes in the bag
Write the details on the outside of the bag, or attach the label so that it cannot come off in transit. Seal the bag tightly. The aim is for the sample and its label to stay together until they arrive at the laboratory.