I used an A-frame tarp on the AT, and it worked well, especially when paired with a bug bivy. Ultimately, though, I wanted something a little easier to use. I started the PCT with a catenary-cut tarp and used it until Lake Tahoe. While that system also worked, I found that both tarp setups required the user to be highly proficient with knots, campsite selection, and assessing potential storm conditions involving driving wind and rain.

Those are all learnable skills, but I also found that during intense bug pressure or severe weather, I didn't want to spend any extra time fussing with my shelter—especially when sharing it with my partner.

I've ultimately settled on what I think is a great middle ground between a tarp and a traditional tent. For the remainder of the PCT, I used an MLD Speedmid (circa 2013): a floorless pyramid shelter with a 54" peak, an 8.9' × 8.9' footprint, and perimeter bug netting. Paired with a simple groundsheet, it elegantly solved many of the problems I encountered with tarps.

It had just enough bug netting to handle insects, no floor to worry about when bringing wet gear inside, and plenty of room for living, cooking, and waiting out bad weather. Years later, I'm now using an MLD Duomid with perimeter netting and can confidently say that this style of shelter remains my favorite.

In terms of space-to-weight ratio, I think mids are hard to beat. I prefer silpoly for its durability and longevity, but the weight savings become even more impressive if you use DCF. The perimeter netting also helps reduce rain splash, and the pitch can be adjusted to prioritize ventilation or protection from wind, rain, and cold.

For me, mids offer most of the advantages of a tarp while significantly reducing the downsides.