Many police tactical units, as well as players of military-style combat games such as paintball and airsoft, use these military-style tactical backpacks and webbing for storing gear and ammunition. There is also a small but thriving industry devoted to creating historical reproductions of military gear; such companies generally produce period-appropriate uniforms and other gear in addition to backpacks.

Backpacks are a standard part of the load-bearing equipment of soldiers, especially infantry, in most countries, and military-style packs are regularly available to civilians in military surplus stores. Well-known examples include the United States ALICE field pack and the British Army PLCE rucksack attachment, both of which are widely available to civilian markets both as actual military surplus (new or used) and as replicas. Such packs are often, though not always (e.g. the USMC's ILBE pack), external-frame packs, with the pack itself lashed or pinned to a metal or plastic carrying frame. For units that are entering combat situations, packs may be loaded heavily and can weigh in excess of 100 lbs. Each soldier may carry extra weapons, ammunition, rations, medical supplies, tents or other shelter material, and extra clothing.

Large backpacks, used to carry loads over 10 kilograms (22 lb), as well as smaller sports backpacks (e.g. running, cycling, hiking and hydration), usually offload the largest part (up to about 90%) of their weight onto padded hip belts, leaving the shoulder straps mainly for stabilising the load. This improves the potential to carry heavy loads, as the hips are stronger than the shoulders, and also increases agility and balance, since the load rides nearer the wearer's own center of mass.
Target has great backpacks for college students and adults, too. They sport large compartments that can hold books, binders, lunch bags, gym clothes, travel clothes, toiletries and more. You can find backpacks with built-in sleeves for laptops and tablets. They also have front organizer pockets for keeping essentials handy, and some even have side water-bottle pockets.
A daypack is a smaller, frameless backpack that can hold enough contents for a day hike, or a day's worth of other activities. They are not large enough for average wilderness backpacking that use full-sized sleeping bags and backpacking tents, but may be large enough for ultralight backpacking. Padded or unpadded waist straps may be provided to distribute weight across the body.
I actually use this tote as a diaper bag, I have two children in diapers and it really works great for that. Aside from the way I use it, I think it's an over all great bag. A few issues: the elastic pockets on the sides seem to have lost their tension already, I don't put anything large or heavy in them to cause this, also the pocket in the back.. Wish it was larger, I don't really see the point of the zipper in the bottom of the pocket. The only other issue I have is the straps, wish they had some sort of padding on them, they tend to be a little hard on your hands if you're carrying anything heavy.