I looked at bags valued at £50 and more ... I didn't fancy spending much after coughing up nearly £3K on my camera and lens! This bags was less than £20, and offers value for money in spades! The velcro pieces allow you to create compartments to suit your own needs. My Canon EOS, EF100-400, lens hood, and all of my camera accessories fit, with space for other bits such as my phone, snacks(!), and event tickets etc!
My only complaint: the zip frequently gets caught in the zip cover ... but I think that's a minor point!