For me depends on where I go:


For work around cities:


- Lowepro Fastpack 250 backpack, 5D MK II, 32GB CF Card, 270EX, 16-35 f2.8L USM, 24-105 f4L IS USM, B+W slim 77mm CPL, Gitzo GT1541T + GH1780QR Ballhead and one extra 5D MKII battery


For any indoor or outdoor events:


- Lowepro Classified 250 shoulder bag, 5D MK II + Battery grip, 1D MK III + extra battery, 2x 32GB CF cards, 1x 16GB SDHC card, 580EX II, 270EX, 16-35 f2.8L USM, 24-70 f2.8L USM, 70-200 f2.8L IS USM, 50 f1.2L USMand lots backup recharger AA batteries


For sport events:


- Lowepro Fastpack 250 backpack, 5D MK II + Battery grip, 1D MK III + extra battery, 2x 32GB CF cards, 1x 16GB SDHC card, 580EX II, 270EX, 300 f2.8L IS USM, 1.4x Ext, 16-35 f2.8L USM, 70-200 f2.8L IS USM, Gitzo GM5561T monopod + Wimberley Arca-type QR adapter C-10andsome backup recharger AA batteries


For Zoo, wildlife, birds etc...:


- Lowepro Fastpack 250 backpack, 5D MK II + Battery grip, 1D MK III + extra battery, 2x 32GB CF cards, 1x 16GB SDHC card, 580EX II, 270EX, 300 f2.8L IS USM, 1.4x Ext, 16-35 f2.8L USM, 70-200 f4L IS USM, 100 Macro f2.8L IS USM,Gitzo GM5561T monopod + Wimberley Arca-type QR adapter C-10andsome backup recharger AA batteries


For dinner, family, etc.... (light package):


- No bag, 5D MK II + extra battery, 270EX, 50 f1.2L USM and few backup rechager AA batteries


Sometimes lens may change around :P