When I was in Las Vegas, Nevada during the summer the Relative Humidity (RH) averages around 10+% and yet I do not see people selling "wet cabinet" with humidifier to store their camera equipments in. :bsmilie:
Besides a dry cabinet at home, I have a portable dry box which I carry around during travels. Suppose you travel for 2 weeks or 2 months, I'd assume you'll be bringing a fairly large luggage? Just put the dry box inside and stuff it with smaller items like socks, perfumes and what-have-yous. That way it's not gonna take up space. You'll see this dry box at almost any camera shops in Peninsula Plaza. $25, if I remember correctly. A bottle of silica gel costs around $3.50, the cheapest I know of if you happen to pass by Compass Point Mall.
When I was in US for 3 months, I put my camera and lens in a big ziplock bag (those used to packing clothes) and put a small pouch (supposedly used for washing machine) of silica gel inside. I just change my silica gel when they turn pinkish.
Not sure if it is best, but takes up less space than dry box.