OK, so I could get cheaper panniers and just use waterproof bags. Nice work.
If you don't get waterproof panniers of some description then when it rains, your panniers will end up getting really heavy and can hold the water for a long time, get mouldy etc. I started off with Alturas, went to Vaudes and ended up on Ortliebs and they truly are worth the investment. Not only are they waterproof, they're pretty indestructible.
Also, get a Trangier for cooking. Also indestructible.
If you don't get waterproof panniers of some description then when it rains, your panniers will end up getting really heavy and can hold the water for a long time, get mouldy etc. I started off with Alturas, went to Vaudes and ended up on Ortliebs and they truly are worth the investment. Not only are they waterproof, they're pretty indestructible.
Also, get a Trangier for cooking. Also indestructible.