Field Gear
Packs, Suspenders, and Lightweight Gas Mask Bag
Haversack, M-1928.  The M-1910 version is also acceptable.  Note that the suspenders for the cartridge belt are integral to the pack.
These views show the haversack opened up and laid out flat.  Left:  Inside,  Right:  Outside.
Suspenders, Belt, M-1936.  These are worn instead of the M-1928 Haversack with integral belt suspenders.  They were normally issued to officers and other personnel whose duties prevented them from wearing the M-1928 Haversack such as drivers and radio operators.  These suspenders were very commonin the armored infantry.
Bag, Canvas, Field, OD, M-1936 (Commonly clled the "Musette Bag."), with the Strap, Carrying, OD, Bag, Canvas, Field.  The "Musette Bag" was issued to those individuals who were issued the M-1936 suspenders.  Note the color variations of these war-time bags.  The carrying strap allowed the bag to be worn slung over one shoulder instead of attached to the M-1936 suspenders.  Late war/post war bags in a dark-medium green (not shown here) usually feature a tab with two grommets for attaching an entrenching tool or other equipment on the front flap right below the U.S. marking.  The later-war bags are authorized for very late war scenarios only and are generally discouraged.

Lightweight Gas Mask Bag.  The gas mask was often discarded and the bag used to carry personal effects or items that could not fit in other packs or bags.  It was also sometimes used as an ammunition carrier or grenade bag.  Examples of this bag have been found in khaki, but most are the medium green shown here.