A good dust-sheet choice starts with the job in front of you. Covering a sofa for a wall refresh is different from protecting a surface beside a busy work area. Before comparing packs, write down what you need to cover and what could reach it.
Start with the surface
For furniture, look for a sheet that drapes over the whole item with enough spare material around its sides. A cover balanced only across the top leaves arms, corners and lower sections exposed. Move small objects out of the way before measuring so they do not create awkward peaks under the plastic.
Then consider the mess. Household dust and occasional paint splashes call for different evidence from prolonged wet work or rough handling. Read the pack's intended-use guidance and avoid treating the word “protection” as a promise against every kind of spill.
Separate size from quantity
Sheet dimensions describe one piece of plastic. Pack count tells you how many pieces you receive. A larger pack does not automatically contain larger or thicker sheets.
Compare these three facts together: the size of each sheet, the number of sheets and the stated protection level. If one is missing, ask before buying. A total-coverage figure is helpful for comparison, but it does not account for furniture height, folds or overlap.
Make a plan before opening
Sketch the main items you need to cover and assign a sheet to each. Keep one clean area for your tools and plan how you will reach the door. Open only the sheets you need for that stage of the job.
For a furniture-covering approach, paint-preparation manufacturer FrogTape also recommends moving furniture together and protecting it with lightweight plastic. FrogTape preparation guide.
The useful question is not simply “How many sheets are in the pack?” It is “Will these sheets suit the surfaces and work I have planned?”