The Computer
I travel with my Two Laptops because I don’t want any worst thing to be happen during the Presentation, One Laptop has always the latest backups of my Source Codes, Projects and Presentations.

My main Computer is Sony VAIO VPCEH3AEG which is use for Presentations and Software Development and second one is HP G61 which have all of the latest backups and in the case any bad thin happen to my laptop I always have secondary machine which I can boot for Presentation. Dear Reader! Always backup your precious stuff who knows when any disaster can happen with us.
The Bag
Mostly I use the default bag that came with my VAIO but for when I need to travel for presentations I need something big in which I can fit all of my required Geeky Stuff along with the laptop. So, I ended with Targus Drifter II Backpack. It is the bad that suits for all of my required needs.

It has big pockets to store things like USB Flash Drive, External Hard Disks e.t.c.
Converters
Each of the computers also needs an HDMI converter.

The Mouse
First, I carry a mouse with me. There are some that will live and die by their track pads, but the moment I can use a mouse again, I’m happy. I’ve traditionally been a trackball user, but trackballs aren’t generally small in size, and since I’m not using any of this equipment for 8-10 hours a day, a mouse is sufficient. I carry two mouse with me first is A4Tech G7-400N,

and second mouse which I carry and my Favorite now a days is Microsoft Touch Mouse.

Thumb Drive
I always travel with two Kingston 16 gb Flash drive although some files can be emailed, but those technologies does not match for a trusty flash drive on your side.
The Batteries

I don’t go anywhere without six triple-A and six double-A batteries. I also make sure that I put fresh batteries into my mouse and laser pointer before I leave on a trip. You can buy batteries on any street corner; unless you need them, in which case there are none to be had.
USB Hub
I always carry a USB Hub with me because sometimes I need to connect 7-8 USB Peripheral Devices and they cannot be connected with a laptop they requires USB Hub.
Chargers and Power cords
Last thing is chargers and Power cords and make sure you carry everything you need for your presentation and while travelling.