What size Pelican for a DSLR?
looking through Pelican's site I thought maybe their 1500 case (1504 to be precise, the model with padded dividers) would work for you. Lay your gear on your bed or table and see if you can arrange them within the dimensions of the case. Allow for around 1/2" of padding between your equipment. Large than that is the 1510 case, but then it might be too big to be putting on a bike. Good luck!