MSP-3 Expandable Hydration Packs with Universal Straps Professionally designed hydration system for law enforcement, military or the hiking trail. Expander zipper adds an extra 3" to the main compartment. Rugged nylon construction. Measures 7"L x 4 1/2"W x 17"H (fully extended). Heavy duty self-repairing nylon zippers with pulls. Large gear compartment. Front pocket has mesh dividers and key hook inside. Easy grab drag handle. Straps for adding Universal or Alice clip pouches. Right or left hose guides. Easy access reservoir pocket. Deluxe 2.5 liter bladder with color matched neoprene hose cover. Padded contoured adjustable shoulder harness. "Keep cool" mesh backing. "D" ring attachment points. Adjustable waist belt.