I have a Down Under brand dome swag, mesh at both ends and the whole thing opens up sort of half way down the side so I can just step into it, and out. It's nice thick canvas and I've never had a problem with it. The other week on the Border Track it rained all night, everyone else had theirs set up under fancy awnings, worried about some splash coming in, mine was on a small tarp out in the rain, I was toasty warm and dry inside. I love the thing, sometimes I'll pick a fight with the Mrs so I can sleep in the garage in it
My sons smaller lighter swag I'm not too sure about, pvc base and light gauge canvas.