1. Yosoo 90 Degree Straight Silicone Tube Bite Valve Hydration Pack Drink Nozzle Camelbak Bladder (Click Link to Check Price on Amazon)
Editor's Rating : 9.3 out of 10
Available in both straight and 90 degree typesEasy to use: Simply push on to your existing tube

2. Aquatic Way Hydration Bladder Water Reservoir for Bicycling Hiking Camping Backpack. Non Toxic, Easy Clean Large Opening, Quick Release Insulated Tube w/ Shutoff Valve (Green 3L 3 Liter 100 oz) (Click Link to Check Price on Amazon)
Editor's Rating : 9.3 out of 10
ANTI-BACTERIA: Food-grade premium quality antibacterial materials. Thick hydration bladder is pressure and wear tolerant. Manufactured with leak proof sealing technology.LARGE OPENING FOR EASY CLEANING: Inner surfaces of the water bladder are easily accessible for proper cleaning and drying. For cold water, ADD ICE CUBES directly from a scoop or refrigerator ice dispenser.

3. Hydrapak Hydraflex Tube, Clear, 48-Inch (Click Link to Check Price on Amazon)
Editor's Rating : 8.8 out of 10
Flexible clear TPU (thermoplastic polyurethane) drink tube48 inch long tube, 1/4 inch internal diameter

4. Geigerrig TUBE GARAGE Drink Tube Insulator and Protector (Click Link to Check Price on Amazon)
Editor's Rating : 9.6 out of 10
Neoprene, velcro tube holster at the top for routing the tube into the pack.Zipper garage with internal wind-shield for protecting and insulating the tube and bite valve.

5. Black Hydration Pack Drink Tube Cover (Click Link to Check Price on Amazon)
Editor's Rating : 9.4 out of 10
36" Hydration Pack Drink Tube CoverFlexible & Durable