I'm not too sure about the holsers, but the flasks and pouches, I could venture a guess at.
If the flasks are run of the mill antiques, nothing rare or unusual, with the spouts working, about $50 ea.. Some might bring more and others less.
Two of the flasks look like powder cans that came in a useful shape. Too bad you dont have lids for those. I'm unsure what they are worth.
Same for the shot flasks, $50 or a bit more if the leathers and stitching are all good.
You could get a very good idea of the value by checking the 'sold auctions' feature @ ebay.