Fabio's Chest: Cordura
The Fab's "classico" :: our best seller-the olive drab cordura fab's. time tested, a modern marvel of space and bicycle touring. Water resistant, slightly less than the xpac version. Both require a driving rain down hill mountain pass to really get soaked.
Flap: Extendable flapper with snap fasteners and dual-closure split back buckles that adjust along the continuous daisy chain to accommodate your growing or shriveling loade.
Side Pockets: Roomy enough to fit a 40 oz nalgene. Reinforced velcro lid to allow quick access while riding. Collapsable and tukt-able when not in use.
See photos for bag dimensions.
Comes with patch sewn on, but you can easily take it off with a $1 seam ripper
Reinforced body is rack-less, unless yer bike is too small and it hits yer tyre; then you need a bag support of some sort (see photos). My bikes are big, so I have no problem with the front or rear. Sometimes I like to use a bag support in the rear so that it sits at a more aesthetically pleasing angle. small racks like the nitto M1 are a great choice for this. Another consideration is that if yer running fenders, that'll be enough to keep the bag from rubbing if you think it'll be close.
Here are some bag supports to check out for rear use:
YELLOW BIRD SOCIETY TAIL FEATHER for lighter loads
NITTO R-10 (for heavier loads and rougher stuff)