2L 70oz Running Cycling Hiking BPA Free Hydration Pack Bladder From $6.59 AC @ Amazon

https://www.amazon.com/dp/B016SSZD1I/
For PEVA bladder:
Price before coupon: $10.99
Coupon code: 40PEVAOFF
Price after coupon: $6.59 (40% off)
For TPU bladder:
Price before coupon: $13.99
Coupon code: 30TPUOFF
Price after coupon: $9.79 (30% off)