I made a bombproof case that weighs 1 oz, for a pair of expensive polarized sunglasses. Here's how I did it (material links provided below):
Pick up one 6' section of 1-11/16" x 1-3/4" x 1/32" Tenite Butyrate Tubing (it weights ~ 0.121 ounces/inch and costs $6 per 6'section) and two polyethylene caps ($0.18 each) from US Plastics. Cut tube to length (mine is ~6") with hacksaw. Cap each end. Add a thin microfiber cleaning cloth to wrap your specs in. Voila... that's it.
LINKS:
TUBE:
http://www.usplastic.com/catalog/variant...ariant_id=42132CAPS:
http://www.usplastic.com/catalog/variant...ariant_id=42106What do you do with the left over tubing? Lots of stuff... perhaps you need a puncture proof container to keep your Ti tent stakes from poking holes your shelter or pack? Have a fly rod? This stuff works great to protect it for only 3.7 ounces... Have a vintage pinup magazine you bring on the trail? this stuff keeps the nibbling pika's at bay...