Thumb Score: +17

Gmt bags us via Amazon [amazon.com] has 18L Everfun Hydration Backpack w/ 2L Water Bladder & Rain Cover (Blue or Orange) on sale for $36.99 – $17 off when you apply promo code B56UEWK1 at checkout = $19.99. Shipping is free w/ Prime or on orders $35+.

Note: Amazon promo codes don’t always apply seamlessly. If you run into this issue, try refreshing the page, re-entering the code, or checking after you select a payment method to confirm whether it already applied.