I have this one. It's 20', so a bit shorter than you were looking for, but I love it. Quite light, collapses down to a reasonable size for strapping to the outside of my pack. The top is quite whippy when fully extended, but it still holds my antenna a good 18' up, which is plenty for a sloper.
Separately, I'm still trying to get my EFHW antenna tuned, so I haven't actually made any HF contacts with this mast, but it's worked great for setup a number of times, and I've carried it all over. Highly recommended.