Fortunately I didn't need my bag, but it was humbling to pack it anyway! I used the 2 links above and the 48 hours in custody article on StopSo to get a good idea.
What they don't tell you is when you go to court and have your bag opened and checked, the Razor, which is allowed in prison, certainly isn't allowed in the court, so might as well not bother buying that!
I got the best outcome for my amount of images (3 year community order, 5 year register/order 45 days RAR and 80 hours unpaid on 1007 images including 110 cat A).