I would recommend a wire coat hanger . When unwound, they can extend quite high, and using a multitool you can fashion the end in many different configurations for cache grabbing. I also once did a power trail in Los Angeles where each cache was a plastic DNA tube stuck into the holes of a street sign. Many were too high to reach, but I was able to fashion a true MacGyvered TOTT to reach them. First, I found a piece of wire left in another street sign ( a fairly commonplace item found in such spots) and bent the tip to just the right shape to grab the lid rim of these nanos and pull them down. They also worked to place the caches back as well.
