A.L.I.C.E. PACK, MILITARY ISSUE -Used, Better Condition. ALICE is a military acronym for All purpose Lightweight Individual Carrying Equipment. Genuine issue military rucksacks come in two sizes: medium and large. The medium pack can be worn with or without a frame. The large pack is made to carry large and heavy loads and to be worn only with a frame. Large packs are sold with frame and straps included.