These extra-large replacement bags are for use with the Safer® brand Japanese beetle trap (70102) to help control invading Japanese beetles. The Safer® brand Japanese beetle trap bags 3-pack works with the Safer® brand Japanese beetle trap (70102) that uses a food and sex attractant to lure the beetles into the trap and disrupt their mating cycle. Most Japanese beetle control products do not offer the food and reproduction attractant featured in our Japanese beetle trap. This provides you with year round protection.