I own both a HH ULBP and the Blackbird. The Blackbird's larger interior room, shelf space, flat lay are design features that IMHO make it a "better" hammock. The side/top entry allows the use of a sleeping bag significantly easier than the HH ULBP. My bags have 1/2 zips. Sort of a pain to get into in the HH. Not sure of the exact increase in actual physical interior space. I used the shelf to store the raincoat, shoes and flashlight. The shelf space is deceptively large. I could have easily added a fleece jacket and small book to the stuff already in the shelf. If you like a sleeping position with less of flat lay just position your body more down the centerline. This opinion is based only on a single night. Tonight is test night #2.