When I was making my DIY burners, which are in no way comparable to the weight and packability of yours, I was considering adding some sort of retention for wearing with looser MTB kit. Possibly a simple toggle-detachable neck cord, like an apron. I guess the design problem is: how could you still get all the benefits of a burner when you don’t wear any tight kit? I’ve got two of three riding buddies who are in this camp. I guess that’s a similar use case to a runner actually.
Had the same thoughts after using under a waterproof shell. It's great but maybe a little wider would help it be retained by bib straps when not wearing anything tight. Mine fell out and was lucky to catch it!
When I was making my DIY burners, which are in no way comparable to the weight and packability of yours, I was considering adding some sort of retention for wearing with looser MTB kit. Possibly a simple toggle-detachable neck cord, like an apron. I guess the design problem is: how could you still get all the benefits of a burner when you don’t wear any tight kit? I’ve got two of three riding buddies who are in this camp. I guess that’s a similar use case to a runner actually.