I think that it mostly depends on what you put into them. I have used a varity of bags for my Food Saver model but have no idea of the thickness of them but I have found that I like the actual Food Saver bags over the others just for other reasons such as the seal that they provide, perhaps that is a benefit of the few extra mills of thickness.
One of the most important pieces of equipment that you will take hunting is a good quality pair of optics and they take some care to give you the performance that you want. So here are a few tips.
Use some alcohol and cheese cloth to clean the lenses. I will usually pick up an extra cleaning kit from my optician when I have my eyes examined.
Don't touch the lens with your fingers. If there is a stick or a bug on them blow it off.
Use the lens covers. They are there...