remember that the only difference in the sizing is the shoulder pads. No reason to hold out for an XL since you can adjust the shoulder pads or buy them fairly cheap from dive rite. Non Dive Rite wings will NOT work properly with the transpac. The reason the DR wings have the cross hair center section is so the center big goes between the cam band slots of the transpac. Lamar can talk about all of the other advantages all he wants, but the design paradigm for the Transpac requires the cross hair center sections so you can weave a cam band through it since it can't accept an STA. It is extraordinarily risky to use another brands wing because there are no guarantees, and actually almost guaranteed that it won't fit the cam band spacing and the ability to accept the cam bands into the transpac.
What Mike is referring to is the standard 11" on center spacing that Lamar came up with almost 30 years ago. It allows the transpac to accept doubles wings and also to use sex bolts to secure the wings from moving up and down on the Transpac. You can't put a STA on the transpac because the bolts will dig into your back, and the stabilizer plates will prevent that, but there is nothing to wedge them against so the tank will just rock all over your back. Much less than ideal.
If you're diving singles and want a Transpac, you have to use either the Travel, Voyager, or Rec wing and I highly recommend against the Rec wing for single tank diving.
