Also be sure to double or even triple bag your coins. I learned this the hard way when the bottom fell out of my bag of coins in the Tom Thumb parking lot as I was transferring it to a cart. Luckily, the cart boy was there to help me gather all my coins into new bags.
The experts at Oxford say the same (http://www.askoxford.com/asktheexperts/faq/abou...). They also answer several other interesting questions about the English language, like what some of the longest words are-spectrophotofluorometrically (28 letters), pseudopseudohypoparathyroidism (30 letters).