Smart Pack can be easily used with two bottles not only in side-mount but also in back-mounted twin set configuration (manifolded twins or independent set-ups)
Make sure the bolts on the bands of your twin set are 11 inches (280 mm) apart, when measured centre to centre. You can easily check the spacing as well as the height of the bolts with the Amphibian Gear tank adapter, harness and wing that all have the right 280 mm distance between the mounting holes. When taking your measurement, make sure the bolts are centred and perfectly perpendicular to the holes and their height is enough to assemble the set but not too long to damage the soft pad and nail into your back.
Mount the wing, then the harness and after the tank adaptor (as shown in photo) to make final adjustments to bolt height necessary to assure ease of assembly. The Amphibian Gear Tank adaptor has the oval lower mounting hole that significantly facilitates the fixing of the equipment on the bolts. Tighten the nuts on the ready set.
Fix the soft pad for extra comfort on harness back. Assembly is now completed.