UCSK - Ultra Compact Survival Kit Unlike others, the UCSK is compact and light enough to be carried at all times. Perfect on your key ring, kept in your rucksack or attached to your hiking gear. Despite its small size, it is an efficient survival tool containing the survival essentials. Size: 0.79" diameter x 3.43" length. Weight: 1.59 ounces. Made in the UK by Polymath Products.