Simms Headwaters Full Day Pack - 1831cu in Fury Orange, One Size Color - Fury Orange. Its Catch & Release modular system allows you to dock other packs on the front or back of the pack when you need to carry some extra gear. Headwaters Full Day pack features abrasion-resistant 42D fabric with a DWR coating and 63D bottom fabric for solid durability and protection against the elements.