When I ride, I use an insulated bag that si the same shape as the trunk on the B. I bought it on Wingstuff pretty cheap. I freeze a few blue ice packs the night before I go for a run and also a few filled water bottles. I put them all in the insulated bag and into the trunk it goes. I also have a full cup on the handlebar bracket. when my cup is empty, I simply stop and fill up cup with fresh ice water which is available all day long. Why carry on your back a weight all day when the B does it nicely in the trunk? Ride safe guys

http://wingstuff.com/products/33637-...addlebag-liner