Yep, I love the original strap for the City and I agree the pockets on City:s are too small to keep much in. On the newer ones (I think from 2012/13?) they added two open pockets on the inside but honestly they're not much use to me if your bag isn't full or you have an insert. As soon as the bag is left to slouch things like phones for ex risk falling out of these pockets.yes, I've considered other styles but I keep forgetting which it best. I think velo strap is not my taste. some of the bags are too large. some too small. city is just right proportion-wise but the outside and inside pockets are small.
If I saw something nice here on the PF or at the local consignment store where I found my city, I might get another Bal bag.
Do you use inserts? I have Samorgas for my bags but there are plenty of other great options. Sturdier or sloppier depending on what look you prefer on your Bal. I prefer to have my things separated in their own compartments and where I can see and find them.