Hello, First off congrats on your special bag, such a fab color!
The Blackrocks & Obenauf's recipe is really not for every leather type and is reserved for leathers that blister or get water mark ie box Calf Vache Natural, Veau Pork,Box Napal,Charmonix etc...
I would NOT use Blackrocks heavily and let it soak in..please don't do that..for some reason folks seem to think I reccommend this...I do NOT. Blackrocks should be used only lightly if at all and ALWAYS remove the excess IMEDIATELY... One can always repeat an application but it can be a big mess if you over saturate your leather..OK?
In fact for your particular bag I would advise a either to
A) leave it be and not too worry too much Chevre is fairly easy care esp in a deep color.
B) a properly applied light application of blackrock and remove the excess imediately let the leather rest at least a few hours buff and then repeat if desired.
C) a properly applied good neutral polish..
D) Meltonian All Purpose Cleaner & Conditioner (this one is the most simple to use...just apply according to the directions on the bottle.. apply with a soft cloth that has the solution on it...
Options B, C and D would give you some weather protection and color transfer protection..
ALWAYS PRE_TEST A SMALL HIDDEN AREA AND WAIT 24HRS TO MAKE SURE YOU LIKE THE RESULTS before proceeding to work an entire panel or area...
Truth is you really don't need to worry about chevre and weather..it does just fine, if it gets some rain just promptly remove the water with a towel and allow the bag to air dry naturally without heat addition and some light stuffing inside the bag if it has really been soaked to help it keep it's shape.