Ending today, Amazon cuts at least 44% off select CamelBak hydration packs, with prices starting from $35.99. (Prices are as marked. Although the banner states 25% off, we found deeper discounts within.) Plus, all orders qualify for free shipping. A couple of best bets:

• CamelBak Arete 18 Hydration Pack for $35.99 (low by $6)
• CamelBak Lobo Hydration Pack for $55.49 (pictured, low by $2)