Duct tape and/or electrical tape wrapped around seat post, not interfering with height adjustment.

Zip ties (various widths and lengths).

Food and water – energy bars, gels, trail mix, PB&J bagel – whatever you like to eat that has a lot of calories.

Emergency supplies - whistle, emergency blanket, lighter.

First aid items, and knowledge of how to use them.

Map and navigational aids (compass, GPS)

Waterproof coat – two coats can be used as a stretcher by turning the sleeves inside out and threading strong poles through the sleeves of both coats