I use Otter Wax on jackets and bags to great effect. You put the can of wax in a small pan of water and heat it up, then rub it into the fabric with a rag. It's very easy. It takes about 3 reheatings and 45 minutes to do a jacket, but you can do a saddlebag in 1 heating and about 15 minutes or so. I also use a hair dryer while the wax is still warm to make sure it melts in well.

(I use the can, but they also make a bar you can just rub on. Can't vouch for how well it works but I'll probably try it when my can runs out.)

https://www.otterwax.com/

I use this stuff on my Belstaff jacket so you know I trust it.