J Cover

@CowperKettle Do you mean something like spillable? That assumes you mean that the test tubes leak through the top when tilted. If not, how are the test tubes leaking in your example?

If I find a year-old, unanswered question, is it better for me to give an answer that I am pretty sure is correct but don't really want to research, a comment-answer, or no answer at all? A comment-answer isn't ideal, (ell.meta.stackexchange.com/questions/4903/…) but I feel might be the right choice. @M.A.R.ಠ_ಠ, seeing how you gave the answer, what do you think is better in this case?