A dry box is a good option but it also depends on various factors. For one, if you have expensive lenses and many camera bodies, then a dry box is a must. Another factor is how rich you are.    There are other pros and cons in the guide.

I am still using my DIY dry box with the thirsty hippo. I think I can stretch the usage of the thirsty hippo to at least 3-4 months (and I'm opening my box almost everyday). In terms of cost, DIY dry box is cheaper but in the long run (over many years), the dry box is a better alternative.

Here's my calculation on the cost:

My DIY container : RM25
Thirsty Hippo x1 : RM16 (price in Sibu, can last for say 3 months)
- that makes it RM16 x 4 = RM64 per year

Use thirsty hippo for 5 years = RM64 x 5 = RM 320

Total cost after 5 years = RM320 + container = RM345

That's about the same price as a small dry box (dry box power consumption is about 3-5w, so not much electricity overhead). However, if your dry box failed, then have to send in for warranty or pay for the repair if no warranty.

By 5 years, I'd probably buy a new DSLR, maybe Sony alpha 2550!!! 

So for me, I'll stick to my DIY dry box for the moment. 

try not to open during rainy day, and keep the container in dry places. those drier/silica gels are not 100% proven reliability. use at own risk.