Hydration is critical during hikes, specially when you go for long hikes you should absolutely bring and drink much water, even when you don't feel the need.
It doesn't matter which type of hike you are going for, what type of distance or terrain: water is fundamental.
Hydration packs are an underestimated resource until you buy one and understand how important and convenient they are.
Hydration packs contain a plastic bag with a drinking tube making it possible to drink without stopping and without having to take the backpack off.
Your body absorbs cool water quicker than warm water; it's important to keep water cool and you can do so easily following these basic rules:
- Blow back the water in the drinking tube or it will be warm the next time you drink.
- Fill half the water bag the night before your hike and put it in the freezer; fill the bag to the top in the morning. This method works perfectly: the big ice block will melt more slowly than ice cubes and will give you cooler water for longer time.
When you buy a hydration backpack you should consider buying one that can carry enough water and has additional pockets for food and equipment. You won't be able to stuff much equipment into your hydration pack pockets but some bars, food and small useful things like a flashlight or a pocket knife.
The most popular brand that sells hydration backpacks is Camelback, but you'll find hydration packs also from other well known brands.
 2 Liters Hydration Water Pack Reservoir Bladder w Valve  US $9.35 |  Lot of 23 Camelbak Hydration Packs US $600.00 |
 CamelBak 2 Liter Hydration Pack w out bladder US $9.99 |  Military Surplus CamelBak Maximum Gear Thermobak3L US $15.99 |
 25L Hydration Water Bladder Pouch Reservoir Olive Tube US $5.99 |  CamelBak Chaos 70 Ounce Hydration Pack US $29.99 |
 OUTDOOR PRODUCTS H2O PERFORMANCE HYDRATION PACK US $.99 |  3L Hydration System Bladder Water Bag Cycling Backpack US $6.49 |
 NALGENE SPRINT CAMELBAK HYDRATION BRAND NEW SEALED US $9.99 |  HydraBoa Hydration Pack Bladder Pressure System NIP US $7.88 |
 2L Hiking Hydration Bladder Pack Water Reservoir Blue US $.99 |  3L TPU Hydration System Bladder Bag Water Hiking NEW US $8.99 |
 2L Backpack Hydration System Pouch Water Reservoir Blue US $6.40 |  NEW Never useD Black Chem Bio Camelbak 30L Free US $80.00 |
 Gerber Caleo XC Hydration Pack 22 11059 Moss Green US $19.99 |  Black Hawk HydraStorm Torrent Extreme II US $17.00 |
 25L Wide Mouth Hydration System Bladder Bag Pack Water US $7.20 |  3L Hydration Water Bladder Pouch Reservoir ACU Tube US $9.99 |
 CAMELBAK FLASHFLO HYDRATION WATER BACKPACK PACK ONLY NR US $.99 |  Hydration Pack Camel Water Backpacking Hiking US $17.50 |
 Hiking Hydration System Bladder Pack Water Reservoir 2L US $.96 |  Camelbak ThermoBak 3L backpack hydration system US $8.00 |
 Kayak Canoe Rafting Camping Waterproof Dry Bag 20L RED US $.96 |  Waterproof Dry Bag for Kayak Canoe Rafting Camping 20L US $.96 |
 HydraMax Water Hydration System 3L US $9.99 |  Camping shower outdoor solar heated water bag kit 5gal US $.96 |
 NEW Camelbak Black MULE 500 Hydration Pack US $20.50 |  NEW CamelBak Camoflauge Viper Hydration Pack US $20.00 |
 NEW Camelbak Blue and Gray HydroBak Hydration Pack US $15.00 |  CAMELBAK ROGUE HYDRATION SYSTEM BLUE 70 oz NEW US $12.40 |
 TWO CAMELBAK Cleaning kits NEW IN PACKAGE US $20.50 |  Camelbak 100oz Classic US $11.50 |
 New CamelBak HAWG 100 oz 3 litre water Beast Resev US $61.00 |  Coleman Max Elate 38L Hydration Day Pack New US $9.99 |
 CamelBak Rogue Hydration Pack Backpack 70oz 2 Litre US $14.50 |  Hydrastorm Hydration Pack US $20.00 |
 NEW WFS 2 Liter Hydration Tank Cargo Backpack Blue LtBl US $9.99 |  Brand New Camelbak MULE US $40.00 |
 Replacement Cyclone Hydration Bladder Bite Valve 2 Pack US $5.49 |  Replacement Cyclone Hydration Bladder On Off Valve 1 Pk US $5.49 |
 Replacement Cyclone Hydration Bladder On Off Bite Valve US $8.99 |  Zone Of Fire Hydration System Pack Backpack Hiking NEW US $19.99 |
 New Outdoor Products 3pc Hydration Bladder Cleaning Kit US $10.99 |  Nalgene Hydration 1 Liter Cycling Skiing Backpack US $7.99 |
 NEW OTRAVO WATER HYDRATION BACKPACK RESERVOIR PACK BAG US $29.99 |  Hydrapak No Slosh 32oz Hydration Reservoir US $.99 |
 AIR EXPRESS 20 L CAMELBACK HYDRATION PACK COLOR BLUE US $12.99 |  AIR EXPRESS 20 L CAMELBACK HYDRATION PACK COLOR RED US $12.99 |
 AIR EXPRESS 20 L CAMELBACK HYDRATION PACK CAMO BROWN US $12.99 |  AIR EXPRESS 20 L CAMELBACK HYDRATION PACK COLOR YELLOW US $12.99 |
 Survival US 3L Hydration Water Backpack Tan Coyote Bag US $8.50 |  Survival US 3L Hydration Water Backpack ACU Pouch Bag US $8.50 |
 Survival US 3L Hydration Water Backpack Blk Pouch Bag US $8.50 |  US 3L Hydration Water Backpack CAMO Woodland Pouch Bag US $8.50 |
 Hydration 3L Water Reservoir Replacement Pack Bladder US $7.50 |  Black Wolf Viper 25L Hydration Backpack 3L Bladder US $85.24 |
 Stainless Steel 18oz Water Bottle Bag Carabiner 3 Caps US $.01 |  3L TPU Hydration System Bladder Bag Water Cycling NEW US $9.01 |
 Platypus Big Bite Valve Brand New For Hydration Packs US $.89 |  THERMAL BUDWEISER BACK PACK 8 DALE JR US $9.99 |
 Camelbak Classic 70 oz Hydration Pack New Never used US $25.00 |  CamelBak Omega Deluxe Resevoir with Flow Meter 100 fl US $19.99 |
 Hydration Pack Fitness Expert Sleek Backpack 72oz US $18.50 |  Camelback Hydrobak Pack NO bladder US $7.99 |
 Camelbak Hydration Backpack 70oz Excellent Condition US $20.00 |  Football Hydromax High Impact Hydration System US $14.99 |
 Camelbak Hydration Pack w Jandd Moutaineering Backpack US $9.99 |  Misty Mate Pump Portable Air Cooler 16oz New NR US $16.08 |
 Misty Mate Pump Portable Air Cooler 16oz New Black NR US $4.25 |  Nathans Whiteout 3 L hydration snowpack US $60.00 |
 Nathans Synergy 100 oz hydration pack US $100.00 |  NEW CHAMELEON HYDRATION PACK BLADDER TUBE US $.99 |
 PRO GEAR BY WRANGLER HYDRATION BACKPACK NO RESERVE US $5.00 |  Camelbak Classic 70oz w omega hydration bag US $8.00 |
 NWT Camelbak Maximum Gear Stealth Hydration Pack US $50.00 |  Cabelas Hydration Pack US $10.00 |
 Field Line Hydration Pack US $10.00 |  CamelBak ThermoBak 3L 100oz Desert Camo NWT US $30.00 |
 CAMELBAK 50oz Hydrobak New US $9.99 |  HYDRATION PACK BACKPACK 2 LITER BRAND NEW US $8.00 |
