Cheap/throwaway and/or durable stuff from Harbor Freight (or Wal-Mart, or Home Depot, or Praktiker, or what have you), that one can use today everyday already:
washable Wool blankets
http://www.harborfreight.com/60-inch-x-80-inch-wool-blanket-92625.html
Poly Rope (does not rot)
http://www.harborfreight.com/1-4-quarter-inch-x-50-ft-poly-rope-90760.html
Nut and Bolt Gauge (for sorting out mixed stuff after field disassembly)
http://www.harborfreight.com/nut-and-bolt-gauge-39240.html
inexpensive/throwaway LED headlamps
http://www.harborfreight.com/five-led-magnetic-head-lamp-93549.html
Cheap safety goggles
http://www.harborfreight.com/safety-goggles-3-pack-66538.html
cheap knee pads
http://www.harborfreight.com/black-cap-knee-pads-46698.html
strong glue
http://www.harborfreight.com/super-strong-quick-drying-epoxy-92665.html