Typical sizes of these products are:
5 liters or less. These bladders are very small and minimal and work only for short, light outdoor activities.
1-1.5 liters. This bladder size works well for people that do short-distance hikes, runs, and bike rides for the average workout of about thirty to ninety minutes per trip.
2-2.5 liters. The most popular water bladder size, this option gives you enough water to not require much refilling and isn’t too heavy or bulky.
3 liters or more. This size is really for the long-term adventurist who plans to keep going for several hours without wanting a refill. It can also be used by overnight outdoor enthusiasts.