After three years of use I am comfortable mentioning the wet weather "saddle bags" that keep my work clothes dry. Swiss M90 rubberized rucksack.
Another bunch of them have shown up on the open market so I am told so they should be easily gotten from a number of vendors.
The main compartment is the same size and shape as the "ammo can" style panniers used on the factory military bullets.
One of my pair seeped in some wetness at a upper seam (
) the fix was to turn the both of them inside out and hit all the stitching with tent seam sealer goop. No soggy work pants since.
I thought about trimming the side pockets off but decided against it because they fit my generic thermos, water bottle and travel tumbler quite neatly.