I've started using my single speed road bike for 100% of my transportation. Until now I have been using a backpack to carry things but I'm thinking about trying panniers so I can do things like get groceries. What are some good starter panniers that won't break the bank but are big enough to carry groceries or my laptop but will last a few years without needing to be replaced. My bike has eyelets on the rear wheel but not the top eyelet by the seat but I understand I can use p clamps to take care of that limitation. I plan on upgrading to a better commuter bike in the future but I plan on riding this bike for at least 6 more months before doing so.