Cole-TAC SERE Sack, Fanny Pack Style Bag, 2.5L, Multicam Black FP1005 The Cole-TAC SERE Sack represents the missing link in your gear's evolution and is the perfect accessory for hunting" fishing" flat-range shooting" camping" firefighting" or performing military operations. We designed this innovative product with SERE requirements in mind" giving you enough space for outdoor gear" emergency medical supplies" survival equipment" and other essentials you might need while moving quickly.