If you've ever used a running vest you'll know why this 10L Blazek pack from Ultimate Direction is so good. It looks and functions like a backpack but feels like a running vest. It fits so snuggly you won't even know it's there and the front pockets on the shoulder straps allow quick access to water and small items, making it the perfect pack for fast paced adventures. FEATURES Padded and breathable EVA back reduces heat and cushions any pressure Tuck-away flex waist belt expands for high-motion while locking down all your stuff Lightweight side conturing harness wraps the load for more comfort and stability Hydration reservoir compatible and mesh side water bottle pockets Adjustable sternum strap expands for when you're breathing heavy Trekking pole connections SPECS Volume: 10 L / 610 in3 Torso Size: 25-50" / 63-128 cm Dimensions (L x W x H): 10" x 6" x 18" / 26 x 15 x 46 cm Gender: Unisex Weight: 16 oz / 478 g No. of Exterior Pockets: 9 Reflectivity: Yes Reservoir Compatible: Yes