If you would like Linda Beren's contact info for good Oberhasli packgoat prospects let me know and I will reach out to her.
Here is a big Saanen doe from Dwite Ashampoo packgoat breeding lines. She is 250+ pounds.
Also posted is a 3 year old Saanen packgoat wether that is 43" at the withers and 295 lbs with up to 2 years of growing left.
There are boers bred for meat and obers, alpines, saanens, lamanchas, etc. bred for dairy and then there are dairy lines of dairy breeds that have the size, conformation, temperament, etc. for packing. You can't just take a Boer meat goat and cross it with a dairy goat and end up with optimal packgoat conformation.