Pannier bags - front and back

[EPR]

Hi guys. So close to finishing my touring rig! Just after the following now:

Bags
- Pair for rear, ~25-30l each, preferably duck cotton or dark in colour
- Pair for front, ~15l each, preferably duck cotton or dark in colour
- Both for touring purposes so waterproof, sturdy, good used condition, etc

Any help appreciated, thanks