Subs need a sealed enclosure with correct air space which a bag isn’t. You’d be better off running a mid bass speaker rather than a sub unless you plan on doing some fiberglass work and sealing off the top of your bags. These are my bags with a 10” PRV mid in each bag. I will tell you that any 8 or 10” speaker will need a lot of power.
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2012 FLTRX, 26" AS Bolt on kit, 26" Mad Wheel, Dirty Bird Top Shelf Rear, Yaffe Tank, B'Cool Front Fender, Fueling 574 Cams, Sikpies Exhaust, 12" Yaffe Bars, Alpine Head Unit, Hertz hpd4 amp, 4 Hertz Spl 6.5s, 2 Hertz st35s, 2 JL 8.8s, Voodoo Speaker Lids, Rear Air Ride