Signal mirror at least 6 cm diameter: For the MDS my signal mirror was a small one inch diameter mirror. Most signal mirrors are not round and thus surface area comparisons are in order. 6 cm diameter equates to just under 30 square cm or 4.5 square inches. Any mirror about 2x2 inches or larger meets this requirement. The StarFlash signal mirror is 2x3 inches and weighs in at 0.8 oz. the SOL Rescue Flash Signal mirror is the same size but weighs in at 0.32 oz. Nothing major, just a little bit more weight.
Not being happy with any of the above I have continued to search for an optimized solution to the size, weight, function and cost constraints. Eventually I came across a potential answer, the Ultimate Survival Technologies StarFlash Micro Signal Mirror.
This little gem is 1.5x2.0 inches in size (only 3.0 square inches) and weighs in around 14 grams (0.5 oz). It is unbreakable, scratch resistant and also has a aiming feature. They can be had for around $5. Not bad. I plan on bringing this along (with a larger backup in case it is not acceptable at check- in due to the size requirement).
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