In reply to CragRat_Trad:
No idea about Gellert brand.
But I've got a few, some no-name stuff and a Tatonka Barrel, as well as handled friends Ortliebs and TNFs and whotnot.
Ortlieb seemed to be the most robust/handy I've seen. But really spendy.
The rest are pretty much the same, if the material thickness is the same... as in robust as hell. To be honest, you can't really fvck up a basecamp/expedition duffel, unless the material is too weak or stiching really crap. Both which you can easily check while having the bag on yer hand.