I recently have to thinking about this as I am a nature and wildlife photographer and head into the wilderness pretty often. I got this A4 paper sized Fresnel lens to put in my camera bag so I can be prepared for the unexpected. The large size helps it trap more sunlight and help concentrate more energy into a small area making lighting fires easy, yet the A4 size makes it easy to store it in most laptop compartments on a camera bag. I hope you find this video helpful.
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Disclaimer: You try this at your own risk. The photographer can not be held accountable for any damages, injuries, or loss of life for trying the things you learn in the video. You are starting a fire. Please use your common sense. Unless you are in a survival situation, please have a bucket of water or fire extinguisher handy to put out the fire in case it gets out of hand.