ULTRA-TRI Lightweight Hydration Backpack Set for Parent-Child Trail Running Outdoor Adventure Breathable Sports Vest Pack

Polyester. Weighing just about 120 grams, this high-performance running backpack combines featherlight comfort with smart functionality. Adjustable chest and waist straps. Lock the pack snugly to your body, eliminating bounce. The advanced breathable mesh fabric keeps you cool even during intense workouts, while its sweat-wicking structure prevents back moisture buildup. Trendy outdoor-inspired prints that stand out on the trails. It's fashion, cute, beautiful to make you the most attractive one in outdoor. Parent-kid set. It has both adult and kid version design. Take it together with your kid, the companionship matters. Dual water bottle pockets fits standard flasks, trekking poles attachment, reflective straps in various positions. Ideal for trail running, fastpacking, urban commutes, cycling, etc. Size Instruction. Size S: fits chest circumference 55 to 75cm 21.5 29.5 inches). Size M: fits chest curcumference 72 to 96cm 2840 inches). Size M: fits chest curcumference 96 to 120 cm 40