I’ve got this monster and have used it snorkeling in the Caribbean and Hawaii. Fully extended, it’s almost 9’ and weighs less than a pound (when it’s not full of water). I had one that was shorter and weighed more and neither one of those things worked as well for me. Collapsed it’s less than 16” and fits in a bag or backpack easy. https://www.amazon.com/gp/product/B08PF7CWXD
I got this for my girlfriend to use with her Hero 9. I have the same ones for my Hero 7.
The only issue with red filters is that if you point the camera up towards the sun whatsoever, it will turn the footage TOO red. So just be careful with that.
Overall we were both happy with how our videos came out.