siltarp or emergency bivy, not a climbing bivy.

don't avoid siltarps, they are versatile, and pack up VERY SMALL.

A viable shelter that packs up the size of an orange. not a grapefruit, an ORANGE.

if i was going to be in iceland for 3 weeks, there would be some nights i'd want to be camping out.

Alcohol stove and cooking cup, sleeping bag, mosquito head net, siltarp, pad.

A siltarp and a mosquito net would be small enough to pack into your cup.