During my tour of duty, I never used this system, however when I saw it on an amazon link, I got interested. I purchased 2 full kits to introduce my kids to the outdoors. These bags when properly packed with civilian gear can be quite practical in many situations both for weight conservation, trust me, unless your prepping involves stocking (casching) a “go to ” site, you’ll always think of something to throw into the bag. And no civilian could comprehend the weight of a Marching load or an assault loads weight. Cache ammo, preserved meals , and medical supplies at the site. Keep the pack simple. What you may think you need versus what you can actually carry could be life threatening. Remember, in a SHTF situation, there will be bodies covered in supplies. Not to sound morbid, but ammo and other “necessities will become available. Also Take daily(if possible) but weekly walks with your gear. This is the best way to build body strength when its time to actually start walking to where ever you have chosen to relocate to.