Don't think you really need to worry about the weight, just try and fill it up as much as possible.
The downside is that if you ride a small bicycle, the csmper may be a bit big and can rub on the wheel, so check if you have a lots of distance between the saddle and rear wheel.
e.g.;
also, the side pocket double up as a water bottle holder - really useful and so easy to reach.
Don't think you really need to worry about the weight, just try and fill it up as much as possible.
The downside is that if you ride a small bicycle, the csmper may be a bit big and can rub on the wheel, so check if you have a lots of distance between the saddle and rear wheel.
e.g.;
also, the side pocket double up as a water bottle holder - really useful and so easy to reach.