I use a Cordura tripod backpack to carry my tripod. It has padded shoulder straps and a zippered pocket that allows me to carry more stuff but I do not use this pocket when birding-by-bike because I do not like having anything poking me in the back as I am peddling. Once the tripod backpack straps are adjusted and the tripod legs are fully retracted it is a comfortable set up. To complete my set up, I strap my binoculars over my shoulders and the tripod backpack so that I can use them with relative ease during the bike ride.
On my first birding-by-bike trip, I had my scope attached to the tripod, which I then carried on my back. I learned very quickly that that was not a good set up since the scope was constantly whacking the back of my head! In addition, carrying all that weight on my back while biking was taxing so the set up I use now suits me just fine.
While birding-by-bike, you hear and see so much more than you would from your car and you have greater freedom of movement to explore areas you may otherwise drive by. For example, on a birding-by-bike trip that Mark and I led just yesterday morning we were able to listen to and watch a small pocket of warblers flitting among the shrubs before moving on to our next stop.
We were also hearing and seeing birds in-between our stops that we would have otherwise missed if we birding by car. Mark and I are fortunate that some of our friends also enjoy birding-by-bike and they are eager to join us on our trips, rain or shine.
I cannot think of a better way to spend a morning in May!