I need a gear bag big enough to hold a 300 prime, a 70-200 2.8 and a couple of other lens, a ton of accessories (filter, brush etc.), and a gripped 50D body. With some room to grow in case I pick up some more stuff. Im in the field all day and need all my stuff most of the time. Any suggestions would be great. Id prefer a backpack, but I havent found one big enough yet that is nice.