A thin mouse pad is useful for a lens changing surface. I came across one at Staples, model number as seen in this link: Staples Basic Mouse Pad, Black | StaplesÂ® I picked one up in black. Thickness is less than 1/8 inch. It's a small size that can be stowed in many camera bags. Good for questionable surfaces when out and about that otherwise would be a convenient spot to lay some camera gear on. It's soft and helps prevent scratches if a given surface acting as your table is concrete or granite.