it is what is cool with TD you can choice what you prefer : choice of pack, choice of color pauldrons, choice of pouches, etc...
i think every one have his favourite, you can make the configuration that you like or doing a screen used troopers with all the good outfit.
i think the most famous pack and trooper is the "move along", but the sergeant is really nice too.
it is really infrequent to see other pack built other to the move along and the sergeant, but it is really nice pack, i hope we can see more of this in future, and maybe now the SE pack becasue of the new ROTJ armor and helmet just arrived.