• The Alpinestars Motion Pack 3 (AMP3) is the perfect technical backpack designed for functionality and for carrying gear, both on and off the bike. The AMP3 Backpack features an overall capacity of 17 liters and is constructed from a heavy-duty tech fabric with structured, padded walls and lower body reinforcements to help maintain the bag’s shape, as well as full, long zippered openings for easy and wide access.