Force Protector Gear (FPG) is a must have. This is one of the best small rucks on the market. I think this ruck is being issued to MARSOC units, hence the name, MARPACK.
The shoulder straps are padded and ergo-metrically placed so they are not only comfortable, but push back and fold away so the zipper to the padded compartment can be easily open. The padded waist strap is well thought out as well and uses a larger fastex buckle for closure.
The padded compartment is not only the pad that provide wear comfort, but can be zipped open where the pad becomes a fold out thermal ground pad for very hot or very cold environments. This is great idea! This pad is connected to the ruck with three pull snaps and can be removed or detached from the ruck for any reason.
The bag has, of course, molle webbing on the outside for the attachment of additional bags or equipment. The ruck main flap opens up to a roomy compartment that can be closed with a cord lock. There are two mesh pockets on the inside that run the length of the inside compartment.
A smaller zippered pouch is located on the back of the ruck with a separate inside pocket. The MARPACK does not come with a hydration bladder, but has the re-enforced hydration bladder straw hole in the top so it is compatible with common hydration bladder – a 100 oz Camel-Bak bladder fits well. Lastly there is a smaller zippered pouch on the very top of the ruck flap suitable for holding easy to get to food; a map and/or compass; fire starting gear; etc.