My Altura Arran pannier is wearing through at the bottom. So I need a new one. I only want one, as I have an Ortlieb office pannier on the other side. My worn one has a 23 litre capacity which is about right for my needs. It's got a zipped pocket in the lid and another on the side. These are useful and I'd like a replacement with similar if possible. I'd rather get something different to Altura now, as this one is only a few years old and shouldn't have worn out this quickly, and I've had a few problems with new Altura office panniers. Any recommendations?