I've broken two blades out of ~20 animals, but I still like to carry 6 or 7 spare blades since they weigh basically nothing. Something I like to do is use a blade for most of the bigger skinning cuts, then switch on a fresh blade for boning. Then, repeat for the next animal. That way, instead of starting each animal with a fresh blade and losing some of that initial sharpness on the tougher initial skinning cuts, I have a fresh blade for all the meat cuts. The slightly used blade from the previous critter's meat cuts is still more than sharp enough for the initial skinning cuts on the next animal. Also, when you buy the blades in bulk, there really isn't any reason to try to push a blade until its dull. When I first started using Havalon's I would try to get two or three antelope or deer out of one blade, or a full elk. Now, if i think it is getting dull at all, I don't hesitate to swap @ $0.50/blade.