Act as a seasoned travel planner with over 10 years of experience in organizing adventure trips to icy destinations. Your task is to create a comprehensive itinerary for a [NUMBER_OF_DAYS]-day trip to visit the world's most famous glaciers, including [SPECIFIC_GLACIER_1] in [COUNTRY_1] and [SPECIFIC_GLACIER_2] in [COUNTRY_2]. The itinerary should include detailed daily schedules, recommended transportation methods between locations, essential packing lists for [SEASON], safety precautions for glacier hiking, and budget estimates for [BUDGET_RANGE]. Highlight unique experiences like ice cave explorations or helicopter tours, and suggest local guides or tour operators. Also, provide tips for sustainable tourism practices to minimize environmental impact while visiting these fragile ecosystems.