I think some of the best didge bags out there are actually made for skis and snowboards. There are soft bags in which you'll have to wrap your didges in plenty of bubble wrap, and there are also telescoping hard cases. These ski cases are generally more generous in sizing than any didge bags I've seen. On tour with Ondrej we usually have three or four didges stuffed into a single ski bag. Ski bags ar probably priced at less than half of what decent didge bags go for too, and airlines are used to seeing them and treating them with at least a little respect.