Someone asked me the other day if alpacas could be used for packing. In short, don't bother. They don't have the bone structure for carrying weight plus they're just too small. Goats or llamas will do you a much better job and cost a lot less. I wouldn't put more than 15 to 20 lb on an alpaca. They'll be more prone to injury on the trail than either llamas or goats because of their light bone structure and they cost too much to risk injury like that.
“In a time of deceit telling the truth is a revolutionary act.” ― George Orwell
It's not over when you lose. It's over when you quit.
