When I first saw the pictures of the slit pouches I started wondering just how they were used. My initial thought was something like a pair of saddle bags or a smaller version over a belt. The PDF article, while it gave lots of details of origin, construction and decoration, provided only this bit of information.
"A longitudinal slit in the upper layer provides access to the two compartments formed by carrying the pouch over a belt or sometimes a powder horn. The latter variant points to the primary function of these bags as containers for bullets, cartridges and other material related to the use of firearms, which is documented in museum records. Other possible uses, such as tobacco bags, may be secondary."
Before I read that I thought they would be much more utilitarian. I wonder if the scholars ever looked inside and sampled whatever remnants, no matter how small, might be found. Rollingb's info on "market wallets" leads me to think the slit pouches were probably used for every conceivable purpose in daily life.
Now I'm wondering what the non-northeast tribes used for similar purposes.