So ...my platform is totally different but also almost the same....mine is the same shape and I carry it in the same position and attach the same way...not sure how.much this 1 weights but mine is 2.25 pounds. This is ridged and mine is soft but firm...
Once I have my platform set in place with the 2 plastic carabineers that hold it I really can forget that it's there....the only time I notice it is if it's a tiny opening narrower than my shoulders...it'll get caught up if I have to turn sideways. Also if u have to crawl or stoop under real low stuff it'll get caught up but other than that I really don't notice it there...my attachment is floppy...like the platform can move easily....I would think it being a ridged attachment wouldnt change much...
I can't comment on the material they used, but the concept and process,.... I can tell u guys, u gonna like it.
The adventurous 1s will be climbing with it I'm sure....with mine being squishy and no good attachment points it's not a good candidate to use to climb with.....but this 1 does