Airport express in Beijing is crowded or not on Saturday morning ?

Hi, I would like to get airport express to terminal 3 on Saturday morning between 8h to 9h am.
I would like to know if it will be crowded and easy to move with 2 bigs luggages?.
My departure station will be huixinxijie nankou on line 10, how much will it's cost ?

Many thanks in advance for your help.
Sebastien