Get a bergen, great for moving kit about.If you're an outdoorsy type of person a large hiking rucksack works well and always comes in handy...
The planet bags are cool but are a pain in the ass realisticaly. Dragging a bag around a muddy field, the train station of on the way to the mega bus o ) is a pain in the arse. A bergan is much easier to get up hill (i.e. the huge muddy hill at NQ!).
A Bergen will fit all your gear, has enough room for your kit and can be used for a number of other applications (such a victimising the smallest member of the team & forcing them into said bag etc).
You also won't mind getting it muddy like your brand new shiney kit bag and can come in a range of agg camos