I just grab a trolley and put the panniers inside the trolley with gear inside that. If using them to buy groceries is the aim, you can manage without a shoulder strap. I tuck the hook over the carrying handle on my Novara panniers so I don't spend irksome moments freeing them from the bottom of the trolley.Take gear out when loading, then take the loaded panniers in the trolley to the bike, free the hooks as I take the panniers out of the trolley and put them on the bike.