The other thing about inflateable PFDs is they have to be worn to be counted as a PFD. So if you have 2 adults in the boat, one with a conventional PFD and one with an inflateable not being worn you can get ticketed. I keep 3 conventional PFDs in my boat just in case I have a buddy or two with me fishing.
Mark, why don't you check the law and show me where it says an inflatable (not "inflateable") PFD must be worn to be considered a legally recognized PFD in Texas? You won't, because it doesn't. Read my post above. There must be a million people in Texas who think this, and they keep circulating this mis-truth, as you are.
Here is a legal and correct statement: If you buy an inflatable PFD, and that PFD is rated as TYPE V by the US Coast Guard, it must be worn at all times when on the water in order to count as your legally compliant PFD.
Texas law requires that you have a TYPE I, TYPE II, or TYPE III PFD. If you take a TYPE V PFD off and lay it down, it's a TYPE V PFD and it no longer serves as your TYPE III PFD. IF you WEAR that TYPE V PFD, it immediately will be considered to serve as a TYPE III PFD and satisfy the state requirement.
The following statement is also true: If you have a TYPE II or TYPE III inflatable PFD on the boat it can count as a legal PFD for any person 16 years age or older, worn or not. If the PFD is a TYPE II or TYPE III, there is no distinction in whether or not it must be worn to be legal - inflatable or not - but it is never legal for a person under age 16.
Where did I learn this? From reading the law, and talking with TPWD Boating Enforcement Division in Austin - the head of that division, in fact. Has this been tested in court? You bet it has. There is even a member on TFF I assisted who defeated an improper citation in court because the officer apparently got his info from you or one of the many others who quickly jump to say you must wear a PFD if it's inflatable or you get a ticket.
Read the rating and use info printed on the PFD itself. If your inflatable is rated as TYPE II or TYPE III, you must have it available for use, but it is not mandatory to wear it, though that's a good idea. My recommendation to people is be aware of what you are getting when you buy one - they're not all the same. Personally, I would never choose a TYPE V device; they're marginal, and too much trouble with the law.
I thought you would have known better. If you call Austin, and ask specifically about the TYPE, you'll find I'm correct.