I'm contemplating the three following: mesh, sil-nylon & 4-way stretch.
The mesh would offer visibility, drying and drainage but would seem to be more susceptible to snagging on branches.
I believe sil-nylon would be the lightest and the contents would slide in and out easily but, if something was wet inside, it would be slow to dry and the bottom would be susceptible to wear when the pack was on the ground.
The 4-way stretch would seem to be the least amount of work. I could just sew a flat piece on like Granite Gear does on their packs. No pleats, billowing, etc. However, I'm guessing the elasticity would fade with time and it may be tricky to sew (might stretch??). I'm also guessing it would be the heaviest material of the three.
I'm favoring the lightest option but if one is that much better for other reasons, I'd be open to using it at the expense of a few extra grams.
Which material for these pockets do you prefer and why?