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Its a system that hasnt been changed much since the original Exos debuted

Although the acceptable load varies from person to person, Lloyd notes, A regular backpack that weighs more than 15 pounds is just not going to sit well on anyones back. First, consider how much your backpack itself weighs (usually in the ballpark of 1.5 to 3 pounds) and factor in the weight of must-haves like your laptop (models range from just over 2.5 pounds for a 13-inch ultrabook up to nearly 5 pounds for a gaming laptop)

That's because spool circumference also comes into play when it comes to retrieve

At just a pound, Miracols super lightweight hydration pack is compact yet can keep two liters of water cold in its built-in bladder for up to four hours on end