Just use common sense. If the growler seems flimsy, it probably is. If it seems built to hold pressure, it probably is.
I have bottled in a thick-walled flip to growler before with no issues at all, but I also have some thin-walled flip-top growlers that I wouldn't dare bottle in.
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!