What is the quickest, most imaginative or most accurate method for her to determine the weight of her freight without using a scale in the traditional sense? Please note that using a makeshift scale (such as one consisting of a pivoting plank and roughly 15 kilos worth of, say, leftover toiletries) is out of the question as said toiletries have been used up, as is any other such contraption. Damaging the suitcase and its contents is permitted as long as the weight-determining method is far-out enough, man! When the determining process is finished, at least half the contents by weight must be left over, as must half the suitcase. (Of course she would want to have more than half her suitcase and its contents when boarding the plane; ideally, no damage whatsoever should occur.)
Do note that the question in this topic is not purely of utilitarian value, but is to a greater extent meant to actuate your creative minds, contribute to general scientific knowledge or simply churn out the most incredible and otherworldly suggestions that, to a reasonable degree of accuracy, actually work. The best answer, chosen after an adequate period for answer submissions, by a tribunal consisting of me, myself and I, will be rewarded with a free TL shirt.
Disclaimer: No conditions apply (except in cases where the shipping costs of the T-shirt would equal the price of the T-shirt alone or exceed it). The grant period for answer submissions will be until the thread disappears from page 1 or, at most, 2 (two) weeks from the date of thread submittal. I will choose 2 (two) best answers, one from the category of answers that include damaging the suitcase and its contents in any reasonably unacceptable way, and one from the answers that will leave the suitcase and its contents intact after the weight-determining procedure is finished. Among those two, the winner of the TL shirt will be drawn either by a poll (moderators willing) or a coinflip. This is not a joke thread. This is not a homework thread.