The next lens I will be getting is the Canon 100-400mmL. I am trying to figure out which backpacks can hold a 20D + 100-400mm attached and still have a separate compartment for misc items (cloths, food). The Tamrac 7 series doesn't seem to be big enough. The "show me your bag" thread shows the Lowepro Mini Trekker AW (II) will hold the lens attached but there is not a separate compartment for misc items. Any suggestions out there or is this not possible.