I have personally put my Sportube on about 30 flights and will not fly without it.  In a Series 3 I can fit several guns, polespears, wetsuits, fins and all my dive gear. Sometimes, there’s even room to spare for clothes, shoes, sleeping bags and other stuff.

I have never been charged for oversized luggage and usually fly with this as my only check-in. I have  avoided hundreds of dollars in extra check-in fees and have flown rest-assured that my gear is safe when I land.  The Series 3 is a MUST HAVE for spearos who fly.