The IOTV backpack is the standard issue for U.S. forces and has built-in MOLLE webbing on which special forces can attach extra equipment like pouches or even other backpacks, like daypacks or rucksacks.
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Design. The ILBE was designed during the Law Enforcement and Armed Forces (LEAF) program by Arc'teryx, and later manufactured by Propper. The backpack is made from 725 Denier Cordura material (725 D), with the MARPAT camouflage pattern printed onto it.
it's not a bad idea per se, but army backpacks have few advantages over most hiking backpacks. The only advantage to speak of would be that army backpacks are often much cheaper for surplus packs. They are also sometimes incredibly durable, thoug that can be hit and miss.
An empty one seems to weigh more than a civilian backpack because it needs to be able to endure a harsher environment for a longer period of time than a civilian backpack, since it needs to carry more weight and the consequences of it failing can be way more serious.