Hmmm... it's a very personal thing but I spent quite a time (and tried many, many options) before buying the Lowe Alpine one I recommended above.
The thing is that cycling is a different action and a different position to walking (& sailboarding!) so the design needs to be different. If you are canted forward whilst cycling, on a bike with drops of a flat-barred roadie, it is best to take all of the weight of the rucksack onto your hips, which means you can wear the shoulder straps a bit looser, increasing comfort, decreasing stress points and allowing greater weight to be carried.
Walking sacks, like the one you linked to, are usually designed to be carried fairly close to the body, which doesn't allow for any air flow and which puts extra weight on your shoulders / wrists / hands when cycling.
It depends on your needs, in a big way. If you are carrying a significant load or over a significant distance, you need one which is the right size for you (back length, shoulder width, bag shape etc) and you won't get that from recommendations on here or from Amazon /
ebay searching, you'll only find out by trying them on. If you are carrying a smaller load or going over a shorter distance, then these things aren't as important.