I have been using one of these for the last few months on the days I dont need a rucksack. Its worked out pretty good, enough room for keys, phone, toolkit etc and enough spaces for a pair of jeans and trainers. Mine had a few too many extra outside pockets which I removed with a scalpel. If you dont mind a 2 week delivery time from the other side of the world then its a good price too. Very comfortable to wear and not intrusive to my riding.
http://cgi.ebay.co.uk/Airsoft-Utility-Shoulder-Bag-Pack-Pouch-Camo-Woodland_W0QQitemZ110460610951QQcmdZViewItemQQptZUK_SportingGoods_Hunting_ShootingSports_ET?hash=item19b7f72987
I have been using one of these for the last few months on the days I dont need a rucksack. Its worked out pretty good, enough room for keys, phone, toolkit etc and enough spaces for a pair of jeans and trainers. Mine had a few too many extra outside pockets which I removed with a scalpel. If you dont mind a 2 week delivery time from the other side of the world then its a good price too. Very comfortable to wear and not intrusive to my riding.