Inner net with Ultra floor

Weight is one reason. The lightest version of UHMWPE-faced Ultra (100) is still ~3osy, which is 2-4x heavier than most tent floor fabrics. It’s my understanding that the Ultra Tent & Tarp version (TNT I think it’s called) isn’t going to be that abrasion resistant since it’s plastic-faced on both sides.

What about Ecopack then?

I was looking at drybags made of that material, and they show impressive abrasion resistance (it’s a promotional video though). Perhaps the issue is that the abrasion resistant layer is only on one side?

”DTRS75 is very comparable in weight to 1.43 Dyneema. This stuff is strong and tough. With an abrasion layer on the outside and a waterproofing layer in the inside.”

Haven’t heard of that fabric and a quick google search didn’t turn up anything. I’d like to know more details…

Although it’s made by challenge, it doesn’t appear to be in the Ecopak collection. Maybe it’s one of their sailcloth fabrics?

“Very comparable in weight” sounds like a euphemism for heavier, without specifics.  Might as well use RBTR 1.4 osi 6.6 silnylon.  At one time it was posted as 1.3 osi, so will weigh a sample from a roll purchased several years ago.

@Chris L, here is a link to a video that showcases DTRS75  purported toughness. Mind you, it’s promotional stuff. https://www.youtube.com/watch?v=kr248ifh_e4

@Sam Don’t know much about fabrics, but I assume that silnylon at that weight would be supper tough, and probably pack down smaller?

I would be skeptical the lamination side could handle abrasion given how susceptible it is to delamination. And it’s heavy compared to other fabrics for the same purpose.

Everyone repeats its great abrasion properties yet once you  put needle holes and thread through it the weave becomes compromised and elongated. Without the lamination the weave cannot stay together.

it’s like everyone repeats the synthetics works when we’re but at some point synthetic will get too wet to keep you warm.

After personally working with the Ultra fabric (Ultra200), I agree with what everyone else has said. The laminate will surely be the first to go, and there are much lighter/better options for a tent floor.

For packs, it’s an excellent option. Even if the laminate fails, and it’s no longer waterproof, a pack liner can be used. The actual fabric side is some pretty tough stuff.

Unless you’re really needing a bombproof tent floor, and you’re willing to carry the additional weight of a separate groundsheet (for when the floor is no longer waterproof), then I’d probably consider something else. Just my 2 cents.