The atc9k weighs bugger all I don’t really notice it, it came with a rubber strap like a dive knife strap ( which i tried and the changed cause the cam bounced a bit)
and a fabric strap with velcro.
putting it on only takes seconds easy as.
Have a look on youtube there are some good reviews and comparrisons of the different wearable cam on the market.
this one is good
IMO the atc9k has the best picture and the best price ones like the go pro are bulky and intrusive to wear.
I was wearing a hat and polaroids in my vid (u can see my cap brim).
Gonna try to mont on the top of my head maybe with a chin strap or something like the inner parts of an old bike helmet to wear over my hat