For those wondering, as I was, here's the payload weight breakdown for CRS-13:

1,080.3 lbs (490 kg) - Crew Supplies

1,567.5 lbs (711 kg) - Science Investigations

363.8 lbs (165 kg) - EVA Equipment

416.7 lbs (189 kg) - Vehicle Hardware

11 lbs (5 kg) - Computer Resources

Total Pressurized Payload (w/ packing): 3,439.2 lbs (1,560 kg)

Total Unpressurized Payload (Trunk): 1,422 lbs (645 kg)

Total payload weight: 4,861.2 lbs (2,205 kg)