a strength. The chines are also a problem area. I'm assuming his tie points are going to do something significant. Now, if they're only going to snub down his laundry basket, then he can put them anywhere.
Tie points in my little universe are for things like the lower end of thigh straps in a whitewater boat.
In any case, the margin of a foam core will have a stress riser to the outside, and foam to the inside. A rather narrow zone to place a tie point that might really have to do something.
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