1. Tactical Hydration Pack Backpacks with 2.5L Bladder for Hiking, Biking, Running, Walking and Climbing (BLACK) (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
Adjustable shoulder/chest straps. Will fit chest sizes from teenagers/kids with 27" up to adults (men and women) with 50" chest size. The chest straps make sure it doesn't bounce when you move Whistle buckle for emergency

2. Arltb 2L (70 oz) Hydration Pack (5 Colors) Hydration Backpack Running Backpack Cycling Backpack Waterproof Backpack Tactical Hydration Pack For Running Cycling – Hydration Bladder Excluded (Orange-) (Click Link to Check Price on Amazon)
Editor's Rating : 9.9 out of 10
WATER-RESISTANT & DURABLE : The hydration backpack is made of nylon fabrics which can be water resistant, thus keeping your belongings of backpack dry and cool in the rainy day. Nylon material is adopted in good-quality plus sturdy metal zippers, making sure the durability of backpack is fairly high. Water-resistant backpack makes it more durable. Meanwhile, our hydration pack has one-year warranty guaranteed.BIG STORAGE & LIGHTWEIGHT : The size of hydration pack is 17.9" x 10" x 2" , which can accommodate 2L / 70 oz water bladder. Also, the hydration pack is lightweight (0.66 pound). Apart from the water bladder compartment in the hydration pack, it includes a big compartment to store your belongings, such as mobile phones, clothes, ipads, snacks, keys, wallet, which provide you with a big storage during hiking / cycling / camping / climbing / traveling and other outdoor.

3. Cycling Hiking Backpack Sunhiker Water Resistant Travel Backpack Lightweight SMALL Daypack M0714 (Green) (Click Link to Check Price on Amazon)
Editor's Rating : 9 out of 10
Material:Highly tear resistant nylon,water-resistantMatReflective stripe,volume control system,adjustable shoulder straps

4. Updated Stronger Hydration Pack with 70 oz 2L Bladder for Running Hiking Riding Camping Cycling Climbing - Best Lightweight Backpack Water Bag for Runner Outdoor Bicycle & Bike Sports (Blue) (Click Link to Check Price on Amazon)
Editor's Rating : 8.8 out of 10
1.PERFECT SET - Include 2L FDA APPROVED food grade hydration bladder2.SUPER LIGHT - Weight 0.77 lb with 2L bladder in high quality of the workmanship & Nylon material, it definitely wont burden you when sporting

5. TETON Sports Oasis 1100 2 Liter Hydration Backpack Perfect for Biking, Hiking, Climbing, and Hunting; Bright Green (Click Link to Check Price on Amazon)
Editor's Rating : 9.2 out of 10
DAY HIKER'S CHOICE: Light, adjustable, comforatable and just the right price for all the included features--makes this pack a terrific companion for all your day-long or overnight outdoor adventuresREPLACEABLE HYDRATION BLADDER INCLUDED: High-quality hydration backpack includes a 2 liter (70 ounce) FDA-compliant food grade bladder with triple-heat sealed edges, 2 inch opening for easy fill and cleaning, kink-free sip tube, cushioned bite valve, and twist-lock to prevent leaks