I slept without a tent in the Australian bush for a few months, and surprisingly never had anything that deadly crawling over me - although did have a lot of run-ins with Huntsman spiders - vicious little critters!
For my money I wouldn't take any other design of tent than full inner plus outer fly - no wildlife getting in and as long as you pitch em right the condensation forms on the fly and leaves the inner dry.
I was going to take a bivvy bag on my next trip but have decided that 4 years in a tent will be bearable, 4 years in a bag would suck - no refuge from the elements other than for lying down with fabric right on your face
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