Does this bag strap around the waist? Nikon Y1 with 2 lenses?
With the bag that I actually have (mine looks smaller) I carry around my Sony Alpha NEX-5 with the short zoom and Sony's flash for this camera and I could add a short fixed length and the camera's USB cable fits in the front expandable pouch; and that's all that fits. Hope this is helpful; think I'd consider a larger bag for what you want to do. My bag does have a "belly" strap in addition to shoulder strap. I got an additional bag apx 4x2x6 that I when needed also carry over shoulder to carry filters, spare batteries for this camera and my wife's Cannon "swimming" PowerShot D10, small apx 6 folding tripod and back up memory chips and small amt of other "stuff" that you do not need every outing.