EngineBird Trail Running Hydration Pack

ENGINE BIRD Lightweight Breathable 12L Trail Running Backpack: With a large 12L capacity, this professional, lightweight backpack features a 3D mesh fabric that is lightweight, breathable, and quickly dissipates heat. It includes two 250ml bottle pockets and a rear 2.5L hydration bladder compartment. A trekking pole attachment system is designed for convenient and stable storage. The backpack itself is light, with size M weighing only 160 grams, providing a stable, non-bouncing fit. It also comes with a safety emergency whistle.