Sporrans are actually pretty comfortable and functional...I often wear one with jeans just to have the extra "room for my stuff"...looks better than a f*nny pack.

Dead animal skin...has been used for years for all sorts of things. Given it's flexibility and durability it would probably end up having a smaller carbon footprint than anything else that could do the job. Personally, I try to avoid exotic furry stuff but look upon bovine leather as re-using the bag that my last hamburger originally came in.

Best

AA