Books
Because there will be few modern distractions throughout your Mongolia excursions, you will have lots of opportunities to reflect, be still, and be present. On those long 5-8 hour rides, though, you might want something a little stronger. I recommend packing one of our favorite travel adventure novels, pen/paper, and audio/podcasts for those exceptionally long rides/downtimes.
A book keeps your mind occupied so it doesn't focus on your surroundings as much. That way, you may blissfully bury yourself in a wonderful book whether you're suffering from an anxious episode of boredom or attempting to drown out a loud surroundings. In these instances, most of us use our iPhones or tablets to keep our thoughts occupied, but reading a book is so much better.
The finest novels are able to positively distract you from your surroundings. It's difficult to draw yourself away from the tale once you've been engrossed in it. This is why, when traveling, you should always have a good book with you. Those moments when you can settle down and immerse yourself in a book will be treasured.