So you're looking for some guidance on how to build a humidor? It's not easy to make a humidor, you may want to think carefully about the project unless you're a skilled craftsman. The most basic humidor, and certainly good enough for temporary and travel storage, is a ziplock bag. If it's going to be more than a couple of days, you probably want to throw in a humidification pouch, such as those made by Boveda. The problem with a plastic bag is you may have too much humidity. The next step up on the humidor ladder would be a Tupperware bowl, or perhaps a cooler. If you add adequate RH pouches, this can work a a longer term solution, provided you add some battery powered fans. Cigar Smokers has a fun project that requires less carpentry ability- you simply convert a cooler to build a cooledor! Of course the ideal, and certainly most stylish solution is a wooden humidor.
When you are deciding how to build a humidor, you need to think about what you would like the finished product to look like. Do you want a dark, rich mahogany, or something light, like oak? Regardless of the wood you decide to use for the outside, you're going to want to use spanish cedar on the inside of your humidor. Spanish cedar is a good choice because it naturally regulates humidity, imparts a pleasant taste to the cigars that are stored within it, and also acts as a chemical free pesticide to fight the tobacco beetle, which can decimate a fine cigar collection in a few days.
Okay, if you're more than a little handy and ready to roll up your sleeves, you're going to need a router, a tablesaw, wood clamps, and some wood glue. This is pretty much common to all the plans. The best guide we've found, which includes a parts list (as well as where to order from) is from Popular Mechanics, Build our Mahogany Humidor. Ty Coleman also has a nicely illustrated guide on How to Build a Humidor. So there you go- how to build a humidor. Given the prices you can find at the humidors auctions, it makes more sense to just pick one up online, and save the bandages!