I'm in the market for a new backpack and have narrowed it down to either a Duluth Sparky Bag or the Filson Rucksack.I know there are a million choices out there for the nylon or cordura bags but I like the old school type backpack out of canvas or waxed cotton.Has anybody had any experience with either of these backpacks?I'm looking for some opinions.It will be used for mostly hunting and some fishing trips.