hardbox options for dslr

[pictish]

instead of taking up a pannier I was thinking of a hardbox strapped to back the question is which type peli type plastic or the trusted old metal boxes.
the kit im taking is

canon 5d 6 batteries
100-400 ism canon
f4 17-40
2x canon converter
about 8 gigs of cards
17" screen laptop+ 3 batteries acer
waiting on my bro to get me a macro lens and a flash from thailand or around there. and may get a 50 prime as well.
lowepro vertex 300 bag
160gb laptop harddrive with a cardreader attachment[very cheap about 70 quid off ebay and extra hardrives can be plugged in] runs on aa batteries
may get a mini videocam as well

been up a few hills with backpack its a bit heavy but very comfy.Got a tamrac one[ thionk expedition 5] which is not as comfy and several of the standard slingbags from lowepro the bigger ones are better as u can put a webbing belt through the back puts the weight on your hip not your shoulder[ think its an aw400]. Also got one of those lowepro quick access bags cross sling shoulder bag pretty handy for a dslr and 2-3 lens plus other bits and bobs.

would certainly never wear anything on my back or keep hard things in my pockets while riding seen plenty of injuries at work just from guys falling on radios, keys, tobacco boxes, prisoners and each other and thats just on foot.