Why pack an extra Ross Momentum LT Fly Spool" Not only is it way easier to have a backup in case a fish wraps your line around a submerged tree branch and breaks it off, it"s also handy in case you targets aren"t biting on your standard go-to line. Thanks to its fully machined aluminum alloy construction and anodized finish, the Momentum LT Fly Spool delivers the perfect balance of hardness and balance.