And does this involuntary opening ever happen when it is locked - or only when latched and unlocked?
I rode to to airport at 5:30 am at, shall we say, "freeway speeds" and didn't lose any of my non-serialized, unmarked bills or classified documents from my iconic, and locked, 22L top case.
And it's such an easy on/off that I will probably never ride with it empty.
All that said... forewarned is forearmed. So I will select or procure an appropriate boingy strap. I have nice, color-matching blue cargo net... Gotta look good...