Osprey Tempest 20 Backpack Review - SectionHiker.com。Very gently used and super rare retro styling of Osprey\'s Simplex 20! Awesome bag for city commuting and weekend hiking trips. Reservoir compatible with 15\" laptop sleeve. Original description: The Heritage Simplex is ready for trips to town or your favourite day hike. Built to withstand the rigours of daily use just like the original. This classic pack offers reimagined modern features, such as an internal padded sleeve to carry a 15-inch laptop or hydration reservoir, and sustainable materials including bluesign®- approved recycled high-tenacity nylon and a PFC-free DWR treatment that sheds moisture.