So, now, I am paranoid about carrying ANYTHING remotely less than solid unless it's in the small quantities in the 3-1-1 bag.
I can't think of an unusual item I take with me when I travel . . . I used to always take all of Amy Tan's novels (well, however many had been published at that point) with me and reread them on vacations. Now most of my spare packing space holds various "long-lasting" treats for Rosalind (keep in mind she shreds toys -- not just treats -- meant for dogs three times her size in a matter of minutes, so finding these treats isn't easy) and many extra towels and blankets for her.