The modified commercial Backpack Subsystem (UM21) contains a backpack, patrol pack, and butt pack. The backpacks state-of-the-art internal frame affords a stable platform sufficient to carry 120 lbs. effectively. The backpack transfers load efficiently from the shoulders to the waist and provides adjustments to fit the 5th - 95th percentile male SOF operator. The butt pack attaches to ELCS or the backpack; the patrol pack attaches to the backpack, and is compatible with the other SPEAR BALCS components.

SPEAR backpack with side pockets

Components

• Backpack
  • weight: 13 lbs.
  • volume:
    • top compartment: 592 cubic inches
    • main compartment: 3042 cubic inches
    • sleeping bag compartment: 1775 cubic inches
    • side pockets: 1692 cubic inches
  • load capacity: 120 lbs.
• Patrol pack
  • weight: 6 lbs.
  • volume: 1945 cubic inches
  • load capability: 50 lbs.
• Butt pack:
  • weight: 2 lbs.
  • volume: 507 cubic inches
  • load capability: 20 lbs.

Logistics

• Backpack system
  • Woodland: 8465-01-478-5730
    • Backpack: 8465-01-478-5725
    • Patrol pack: 8465-01-478-5755
    • Butt pack: 8465-01-478-5743
  • Desert: 8465-01-478-5727
    • Backpack: 8465-01-478-5750
    • Patrol pack: 8465-01-478-5746
    • Butt pack: 8465-01-478-5740
• Arctic cover
  • for backpack: 8465-01-478-5749
  • for parol pack: 8465-01-478-5744

Instruction

• UM21 Universal Military Backpack Subsystem Use and Care Manual [pdf]