Several things come to mind as I read the post:
1. If you haven't had professional training in rappel techniques, get some or don't do it. It's more difficult and dangerous than it looks.
2. ONLY use the correct equipment. Most items needed for an emergency egress are small, light weight, and easily carried. Some vendors market this equipment as "Firefighter Bail Out Bags".
3. Equipment should include (at a minimum) 50'- 100' of 8mm low stretch kernmantle (4-4.5K tensile), (2) 1" tubular webbing (one for the anchor and one for the harness), and (4) locking aluminum carabiners.
4. A pair of gloves with leather palms (minimum).
LEARN TO USE THE EQUIPMENT CORRECTLY AND SAFELY. This is a small investiment that potentially has a large return. YOUR LIFE!!
To do less than what is suggested above is inviting grave personal injury or worse, IMHO. YMMV!!