It's important to drink enough water when you're mountain biking, so it helps to have a hydration pack that's specific to the sport. The best hydration packs for mountain biking will have certain features that make them better suited for cycling than other activities.
First, the exterior material should be tougher for mountain biking packs. It will need to stand up to regular wear and tear on the trail from all the dirt, dust, rain, and other natural elements. Look for packs that are made from durable synthetic fabrics like nylon, CORDURA, or polyester.
As for the bladder itself, it should be made of high-quality material, like TPU, and equipped with bacteria-fighting technology to prevent odor from building up. This is especially important for biking because it can get pretty hot during long rides.
Lastly, think about the bite valve and tube. You'll want it to be easy to access, preferably with technology that lets you drink one-handed or completely hands-free.
During exercise, it's recommended that you drink a minimum of 7 to 10 ounces of water every 10 to 20 minutes — and mountain biking is extra rigorous, so you'll often need more than that, depending on heat, incline, speed, fitness levels, and other factors. Make sure you plan appropriately.
To help you out, I've researched dozens of options and made a list of the three best hydration packs for mountain biking. I've arranged them according to price to help you find the one that best fits your budget.