This 2.4 backpack is just about perfect. It's depth fits my Olympus M1X with a little room to spare. It has enough room for my 300mm f4, 7-14mm f2.8, 12-40mm f2.8, 40-150mm f2.8, and I still have room probably for a least one more, maybe two more lenses, plus other assorted small camera gear (teleconverters, caps, tape, etc.). There is a top compartment that I can stuff with my jacket, that has access not only via the back panel but through the top. The front compartment can also hold a second jacket, gloves, snacks, pads, and tablet. I've yet to fill this pack up. Of course, it has two water bottle side pockets that can also be used to carry a tripod. The bag is comfortable to wear, although the waist belt really doesn't ride on my hips as much as I would like it to (it doesn't ride low enough).The zippers work very well and easily, even when under strain or tension (as when you are accessing your gear through the back panel while wearing the pack). Another thing I like is that I can fold back the waist belt around to the front of the bag and buckle it, and then also fold back the shoulder straps to the front of the bag and buckle them together using the sternum strap. This makes it easier to transport and avoids snagging the straps on something or dragging them around. The bag would be ABSOLUTELY perfect if it also had a side handle so that then I could carry it like luggage.Needless to say, and somewhat to my surprise, this is the best camera bag/backpack that I've ever had. Works for me perfectly.