if you have the storage space, and of coz depending where you will be travelling to... you can have that dry box but a smarter way is to get ziplock bags and some silical gel and you get instanteous cheap 'dry box'.
Of coz this is used in high humidity places.... and that you are staying for a long time like say 1 month.. 1 -2 weeks is okie IMHO
if you go to hk for less than a week i would think its not too bad...I do not usually bring silica gel as well when travelling too troublesome I guess...
But if you are really KS, why not consider zip lock bags instead of a dry box? You can put the silica gel and camera inside the zip lock bag, just like you would a dry box.