For several years, Jack Pitcher has been using a little kneeling pad, and I always thought it looked a lot handier than the usual gardening pads (I have one). I finally copied the ID data on the pad, and Googled for it. One of the first 'hits' was Amazon.com, so I bought four ($40.44), to split the shipping cost, and to sell them to club members (at below cost!....$10).
The picture shows the carded item as it hangs on the peg in the retail stores, if you can find one. The pad itself is folded in half, and is about the size of a wallet. Fits nicely in the hip pocket, but also has a mini-carabiner snap that will hang it on your belt loop. Jack said he caught his lines in it once when rolling the lines up, and ruined the lines, so the hip pocket is safer. The pad has a tough rubbery surface that goes against the ground, and a nice nylon-ish surface for your knee cap to rest on. Inside is a 'gel' pad...supremely comfortable. The nicest thing about it is that you can have it in your hip pocket (or hanging on the belt loop) all day long, so if somebody asks you for a launch, you are ready to do so without knee pain or getting grass stains on your new chinos...
Google for Tommyco Handy Kneeler. If you find the manufacturer's website, you may be able to find a local retail source, but Amazon.com is pretty easy to deal with.

Steve