I've been meaning to draw this for a while:
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I forgot who, but somebody earlier drew a rough sketch of a dual-packed missile which I wanted to draw on Paint. Here each box is 85cm x 85cm. The two upper tubes have 10cm width peripheral exhaust vents represented in red. This allows for a maximum missile diameter of about 32cm. The bottom dual-packed configuration allows for a maximum missile diameter of about 45cm. This was somewhat eye-opening for me, as I did not expect such a large diameter would be possible with dual-packing. This opens up the possibility that a missile like the CY-5 or the Yu-8/missile booster or even a modified HHQ-16 with folding fins and strakes, could all be dual-packed in a 7m UVLS tube.