I would also recommend you consider a back plate and wing. An aluminum back plate is very light weight but will be more than sturdy enough to handle your travel diving needs unless you travel to do serious cave diving. It will also serve double duty by providing protection to the stuff you pack beneath it in your travel baggage. An additional benefit is that because a BP/W has relatively little padding, if any, adding to unnecessary positive buoyancy, one can typically shed some of the lead they need to wear to get down.
There are a lot of good options on the market for lightweight travel friendly BP/Ws:
-As already mentioned Vintage Double Hose (VDH) 18# wing and aluminum plate
-Edge-Hog Aluminum plate and 23# wing
-Dive Rite Ultra light stainless steel plate and 25# travel wing
-Dive Gear Express (DGX) aluminum plate and 30# travel wing
-XDeep Ghost system
-etc, etc, etc
If one is used to having integrated weights in their BC, quick dump weight pockets are available from some of the companies above as well as others, or one can forego the expense and clutter of the pockets and just use a weight belt which should be less cumbersome with the reduced amount of lead needed. Trim pockets to mount on the tank straps are always good to have and are relatively in expensive and will help to get the lead positioned where it is needed for proper trim.
The SB community tends to recommend BP/W when the question of buoyancy compensation decisions come up. Whether the BP/W is over-recommended is the subject of another discussion, but in the case of travel, unless there are clear design features you are looking for in a BC, the bare-bones one can achieve with a BP/W without sacrificing durability lends itself to packing and travel in a way that some jacket/vest style travel BCs have a hard time approximating.
-Z