A:AnswerSeems like an easy question to answer but it isn't. So here is the best I can give and hopefully it will help you out. The first dimensions will be the exterior from outer ridge seam to outer ridge seam ( not including the handle in a raised position)
(Exterior)
Length = 13"
Width = 19"
Depth = 6.5"
(Interior)
Length = 10.5"
Width = 18"
Depth = 5.75" (compressed)
3.75 ( relieved) So there in a compression factor of 2" for cushioning equipment.
The insides are very easily modified for different layouts. All that is needed is supplied. I find it large but not too large to transport, but not quite big enough to carry my large lens and a camera with a lens attached. So my standard lens is detached from the camera body. Not a big deal but as consideration. Hope this helps.