I had her on a harness when I first got her, I didn’t realize they can be dangerous to them sometimes, but I did let her run and hop wherever she wanted to go. I basically was walking quickly along with her
She’s grown out of it now, but I do definitely agree that an x-pen outdoors is more safe now, or a stroller if I wanted to go for a walk with her.
So if I were to get a harness for her to wear while in the stroller, if for some reason I had to open it and get her out, I would probably use one of those retracting ones that can be pulled out pretty far, so it wouldn’t pull her if she did happen to jump out. I have yet to have an incident that she tries to jump out when opened, and it is a fairly deep basket for her to sit in.
Though again, I’m hoping I never have to open it with her in it while using it outside. I would like to actually get a carrier that I could create a secure attachment to the stroller frame and use that instead of the basket. That was my initial idea and probably a lot safer and easier than the basket it comes with 