But you take pics of birds on sticksDepends what you want to use it for, It can be carried happily around all day depending on your physique, I use my 500mm 90% of the time without a tripod just walking about and handholding all day long
Is the OP using it for around a town centre or out in the wilds of Worcestershire... .
Depends what you want to use it for,
depends on what you are after shooting, I do walk about with my 300 2.8 but use it with a monopod it makes life much easier