I have both Ben's 30 (still unopened) and Natrapel. I keep both in my closet. I checked for expiration dates, but all I could find are lot numbers.

How long does insect repellent last?

Jeanette Isabelle
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I'm not sure whose twisted idea it was to put hundreds of adolescents in underfunded schools run by people whose dreams were crushed years ago, but I admire the sadism. -- Wednesday Adams, Wednesday