The first is a HEPA-filter equipped blower bulb. I use the Orbit bulb, which I got from B&H for about $25. Any time the sensor is exposed or I change lenses, the last thing I do before closing up the camera is blow off every surface. It's become an automatic habit.
The second is a small, thin, waterproof ultralight picnic blanket/ground cloth, which I put down to give me a clean surface on which to set lenses, etc. Weighs almost nothing. I have the "Odoland" brand from Amazon, about $10.