For the OP, I would look at the AquaLung Outlaw or the DiveRite TravelPac.
Dive Rite TravelPac BC, Black
If you really want QR weights, you can add the Dive Rite QR weight pouches to the TravelPac or many other BCDs. Personally, I would just buy DGX Trim weight pouches and put them on the tank straps. They would not be ditchable. But, if you're weighted properly for a warm water, single tank dive, you shouldn't need ditchable weight anyway.
And if you do not really need QR weights, then I would also consider the ScubaPro Hydros Pro, with the travel waist belt installed. With the bulky weight pouch waist belt, it's not very travel friendly. With the travel waist belt, it looks like it would pack about as small as any of the others mentioned.
And, has been mentioned, if you do not need QR weights, you could also go with a lightweight backplate and a small (17 - 25# lift) wing. My new "travel" rig is the Freedom Contour plate with a HOG 23# wing. The plate weights 5 #, but the rig is small, streamlined, and SO comfortable.