Tom Bihn Aeronaut 30

Buy one at Tom Bihn 

Specs:

Dimensions: 19.7″ x 12.6″ x 7.9″ / 500 x 320 x 200mm
Weight:
1050d high tenacity ballistic nylon: 2 lbs, 14 oz / 1300 grams
400d Halcyon®/420d nylon ripstop: 2 lbs, 6 oz / 1070 grams
Volume: 1830 cubic inches / 30 liters (ASTM Standard Measure)
Total O-rings: 9 (4 in the main compartment, 1 in the inside mesh pocket, 1 in the left curved pocket, 1 in the right curved pocket, 1 in the left side pocket, 1 in the right side pocket)