You can use the built-in humidifier if you like. I think it's easier to use a pillow or tube of beads myself, but the choice is yours, should work fine either way.
If you use the little humidifier, just give it a spritz of distilled water and you're good to go for a few days. As everyone else has said, a humi-pillow works so long as it doesn't take up too much room in a small herfador.
depends on how long of a trip. If its more than 2 days, then you should probably use some sort humidification, but if you are using it for an overnight, the humidified cigars and the air-tightness of the herf, you can just wing it without humiidification. I don't like using up the small space with a humipack or tube, so I use the puck with the solution, but you do have to have a keen eye in soaking it only a little at a time over the course of a longer trip so you don't over humidify. It's a small space in there.
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Brought along a good supply of my favorites, and was even able to re-stock from a local B&M with some ISOM sticks.
I even found some sticks made in Canada from Cuban tobacco. I am looking forward to trying them out.