Our Personalized Dog Backpack is constructed of heavy-duty, lightweight, water-resistant 400 denier ballistic nylon material. It will work as hard as your dog!Features:Two 2″ adjustable nylon straps across bottom help keep the pack firmly fitted and in placeMedium and large have breathable mesh across back to prevent overheatingSmall has webbing strap across backFully adjustable elastic chest strap with metal bolt snap for easy removal and to ensure a proper fitHigh quality quiet pack zippers for quick easy accessAvailable Colors:BlackGreenRedBlueYellowPinkMochaPurpleDigital CamoAvailable Sizes:Small Pack – For dogs up to 25 lbs – Webbing strap across backMedium Pack – For dogs up to 75 lbs – Mesh across backLarge Pack – For dogs up to 125 lbs – Mesh across back