What do you want to put into it, my 100mm usm macro disappears in it very nicely....Apart from the velcro pockets, there is also a zippered one underneath that folds out.
5" INON dome unit
Canon G9
Epson P2000 (6" x 3.5")
2 x Z-240's
2 x YS-25's
2 x INON close-up diopters
Strobe arms, battery chargers, batteries and spotting lamps can go in the hold baggage
You can also take a look at one of these: 5.11 Royal Robbins tactical vest. They can generally be found at Army/Navy surplus or police supply shops. They can also be had on the internet. I used one in the military and still have it and use it every now and then. Very well made and strong. I found them on the internet this AM for $60.