Grave Digger Buck Urine's scent stays strong regardless of weather conditions and is specifically designed to resist moisture and freezing. This powerful combination is packaged in a heavy-duty bag with an airtight seal, locking in freshness. Once opened, the TRS (Time Released Scent) peaks the curiousity of trophy bucks with the scent of a new buck that lasts up to 30 days. This eliminates the need to re-visit scrape sites, thus preventing contamination by human odor.