Hi, this is my first post on this wonderful site, so bear with me.I just upgraded from a D3100 to a D7100 and I also just brought the Yonguno yn-565. My issue is my Lowepro 200 sling bag is not cutting it. Does anyone have any suggestions for a backpack type bag? I initially plan on carrying my D7100 with Tamron 18-200 laptop, Nikkor 50 mm. the flash and a few accessories. Any help in this matter would be appreciated.Thanks in Advance.