I've never flown in a SuperCub, my two gun Americase is the most excellent gun travel protection I have- but might keep small plane from clearing the trees at the end of the runway, I use it to protect them when traveling on the road, I expect the case will fare better than my truck in an accident.
In my opinion the best protection for practical travel is a TuffPak, but fit could be an issue, and if you insist on the duffle option it won't work.
Pelican makes some very strong lightweight cases that might fit your needs for sizing, I have some friends that travel with them and like them.
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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