Ideal for day or hiking packs, this hydration reservoir features a neoprene insulated feed tube and durable silica gel Food grade BPA-free Thermoplastic Polyurethane (TPU) materials Fully welded anti-tear construction Anti-microbial and anti-fungal 7mm diameter and 97cm long insulated feed tube Soft durable silica gel bite valve mouth piece with easily controlled on-off mechanism bite valve.