philbut

You will struggle to find any secure stuff if pac safe don't do any. I've ridden with a 25 litre tank bag with no problems, I'd say maybe give it a bit longer to see if you can get used to it (they are also good for lying on on long motorway journeys). If you really don't like it, I'd suggest an oxford "first time" tail pack as a good starting point. They are pretty big and you can fit a full helmet in there, but don't cost the earth. I tend to go for Oxford stuff as it is good quality and seems well thought out. Their panniers come in a few differnt styles, but I went for the sports. if you have a high level can you might need to look at the "humpbacks" range.

If you want secure luggage your only option is to go for hard luggage like Givi - and this will be expensive, especially if you buy new.