the tr8 is a reduced-to-the-max, super-light, super-slim backpack with a tripl3 flow system vented back and hydration system compatibility. the tr8 is a reduced-to-the-max, super-light, super-slim backpack. essential features such as a tripl3 flow system vented back, hydration system compatibility, a helmet carry, a sternum strap and hip fins make it awesome for a quick blaze around the trails or a full adrenaline-fueled day out.