I have both Seek Outside DST tarp and the Seek Outside Eolus. I used to use a OR bivy but it leaves much to be desired. The Seek tents/tarps weigh pretty close to the weight of many bivy. I do carry a lighweight Bora Gear bivy (5 ounces) for use under these floorless shelters when I know its going to be really wet.
If I were to replace either it would be with a Seek Outside Silex. Both the Silex and Eolus provide much better coverage than a tarp.
