need new bag advice

[Jm Photography]

So i need some advice on what bag to buy. I have a compudaypack which is performing wonderfully for the load out i always bring but now I may need a new backpack to carry xt or 30d if i upgrade, 50mm 1.8, 18-55 and a 70-200 F4 and a laptop/bibles other assorted related thing. the national geographic bags look very nice and won't draw as much attention since I will be doing urban missions and community outreach.
I hope I typed this legibly heh.