If you are looking for cheap, (semi-) airtight containers you might want to look at tupperware/icecream boxes. You don't need a fancy high end solution, your parts wont cease to function if they are exposed to a little bit of humidity. As long as you don't pack the components while you're showering you will be fine.
If you don't want to use silica gel (or any other desiccant) you have to get rid of the moisture that is still inside the container. A good way to do this would be to heat the container to 75 °C for 6-12h before you put anything in (although that is really not necessary for your use). Btw, if your container is airtight you only need the silica to get rid of the initial moisture, so you only need a small amount (a few grams).
(The absolute best solution would be to put your electronics inside a Schott laboratory glass bottle while everything is inside a glovebox that actively removes moisture, that way you can store it for years at sub-ppm levels of humidity. Is this a practical solution? Absolutely not.)