Originally Posted by saddlesores

i see volume, but where's the weight? dimensions don't really make much difference, within reason, other than wind resistance. how many kg's are you gonna gotta schlepp up and down hills all day long?

pack your stuff in bags and weigh each bag. weigh your bike. weigh yourself in your bike clothes and shoes.

also consider a front rack with small front bags, move some weight off the rear wheel.