Bottom:
The HUSKY 42 Gal. Clean-up Bags (50-count) are ideal for all your tough clean-up jobs. Featuring a tear and puncture-resistant design, it includes true tie flaps and 1-by-1 dispensing for an easy use.
www.homedepot.com
I'm dead serious too. 3mil plastic is going to be better than any poly that's sewn to the bottom of a blind, easier to replace, and less of a hassle to deal with.
I have a Rhino pop up also, IMO bags are better than any tent floor or footprint I've used when the ground actually has water in it.
Also, if you're planning on sitting on the ground, DON'T:
https://www.amazon.com/DEERFAMY-Folding-Camping-Portable-Slacker/dp/B095NW8KLQ/ref=sr_1_5?crid=38ZWQGAOINC0K&keywords=folding+3+leg+camping+stool&qid=1697679928&sprefix=folding+3+leg+campoing+stool%2Caps%2C99&sr=8-5
Not comfortable compared to any real seat, but I've done the whole sitting on the ground BS and it's miserable.