American and United have me considering storing a set in Cozumel. We have a airline compliant suitcase that we can get 2 full sets in and it weigh 46#. Regs and computers go in carryon.
Our gear adds $50 a trip. That $50 let's me dive a rig that I set up exactly how I wanted and I have more faith in than rental equipment. I doubt I can rent a bcd, reg, computer, and fins for $50 a week, but I've never checked. While I haven't been on a ski slope in 20 years, No matter what happens to me on a ski slope...I can still breathe. 120 feet deep and I can't say the same.
The hassle of an extra bag and the chance of a lost bag adding stress to a dive trip is more of a reason to store gear or rent it. The bag cost is minimal considering a week long dive trip in Cozumel is going to cost me $2000. $50 I'd about 15 less Bohemia Obscura's (THE best beer in the world) so I'm probably better off...and skinnier...dragging the extra bag.
I would love to have a bcd and fins stored in Cozumel so I could throw everything else in a carryon and go when airfares were cheap. Lately we have been catching great deals on Southwest to Cancun so Gear has been included in the fare. If Southwest changes their policy, I may change my mind.
Safe travels,
Jay