I take two 6 inch diameter peel and stick adhesive (PSA) sanding disks and stick them together for quick hand sanding. They become rather stiff when stuck together and are very sturdy and hold up well. I stick together a 150 and a 220. Or for general carpentry work a 60 and a 150.
If you have never used one of those rubber blocks for cleaning sanding belts and disks you are in for a real treat. They really work and your belts and disks will last a very long time.
Although the new 3M sanding products sold at HD are significantly better than the previous handyman stuff you need to try the sanding products made by Klingspor available on line at
www.woodworkingshop.com or at one their 4 stores in North Carolina. Abrasives are their speciality and you can tell the difference.