Our first thought after seeing the Kerry Bag was, "A bag for plywood? Ha-ha, boy that's dumb. You've got to be joking!" Then, about three hours later, we were at the lumber yard, loading up a few sheets of 1/2" CDX in the pouring rain, having second thoughts about the matter and wondering exactly who the dumb one was. Using ratchet straps to hold down a tarp is only going to get you so far.
So maybe there's something to it, and maybe not just for truck owners. The durable bags might also be useful for general shop storage as well.
From the video, it looks like getting the first sheet in is a real bear (even harder if you don't have a full-sized truck bed), but after that it seems fine. If we had one of these things, we'd just keep a sheet of 1/8" luan in it at all times to solve that problem.
Actually there are a number of Kerry Bags, for all sorts of common construction (and non-construction items, from cement bag pallets to the mattress pouch.
The plywood pouch costs about $60, which sounds like a lot, but it's less than the cost of two "ruined-by-rain" sheets of 3/4" birch ply.
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