Shelters -- tents, tarps, bivies, hammocks.
Backpacks -- backpacks, daypacks, hipsacs.
Sleeping Systems -- sleeping bags, blankets, quilts, non-sheltering hammocks
Clothing -- outer, mid, and inner layers
Footwear -- boots, shoes, sandals
Cooking -- stoves, pots, utensils, ovens, espresso makers (smile)
Others -- flashlites, GPS, compasses, ice axes, chairs, binocs, first aid kits, fishing poles, etc.