Military1st has a lot of awesome products in their store. And if summer heat is making you problems then Pentagon Hydration Backpack is the solution you need.
PENTAGON HYDRATION 2.0 BACKPACK
Durable and practical Pentagon Hydration 2.0 Backpack is lightweight and easy to use mission bag with a water supply delivery system.
The pack comes with a padded main compartment and two external utility pockets, anatomically shaped shoulder straps, flexible chest strap with integrated emergency whistle, adjustable waist strap, 3D mesh padded back and tough MOLLE webbing.
Antibacterial hydration bladder included.
Perfect hydration solution for hiking, trekking and travel.