The Gregory Baltoro 75 Backpack is a better choice for multi-day backpacking trips due to its advanced suspension system and larger capacity, while the Rei Co Op Trail 25L Backpack is more suitable for day hikes and short trips due to its lightweight and compact design. According to Backpacker Magazine, the Gregory Baltoro 75 has a 'superb' suspension system, while the Rei Co Op Trail 25L has a...