Ours are Trident Aquacraft extra large ballistic mesh duffels. Ample for full kit, carrying strap + handles, rolls up to go under boat seat or behind bulkhead. I think they're out of production, but there are some on eBay.
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Hmm so you use a soft bag to check-in your expensive gear with no fear of crushing weight of other luggage on top of it in the cargo hold? Moreover I saw videos where locked zippers can be easily slit open with a ballpoint pen by sliding the tip between the teeth.The big daddy is a Stahlsac Curaco that has a LOT of room, dedicated fin pockets on the sides and a robust pull handle and roller wheel system... That "checked" bag gets me and the bulk of everything I need to my designation. My reg sets, camera gear and mask always go into carry-on...