[Southpaw]

Thanks for sharing and that is a nice looking case. That one carry strap looks like nice bridle leather that needs probably a little more deeper conditiioning to extend its life. Its showng signs of dry rot. You may want to hit again a few times with the Black rock stuff and let it soak in some more. Have never used the black rock before so don't know its properties or how much it will penetrrate. Leather that has been forgotten some needs a little more of a process of reconditioning than just one or two steps sometimes. Since you already have the blackrock maybe just need to hit it one or more times to just be sure.

A lot of the paste stuff is more of a topical treatment. Sometimes bridle leather needs more deep conditioning throughout. Lexol condiitioner, maybe the Kho-Cho, Red Wing Oil or mink oil. All will probably do it but it needs to be like an oil or gel to really penetrate. Orvis Gokey leather conditioner works well also.

Once had an old Duluth pack that the straps looked like yours since stored it away and forgot about them. Thought I was going to need to replace the straps but used some Red Wing oil and it really brought them back but I am certain there other products that can do the same.