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Systems of randomly packed, macroscopic elements, from jammed sphericalgrains to tangled long filaments, represent a broad class of disorderedmeta-materials with a wide range of applications and manifestations in nature.A `bird nest' presents itself at an interface between hard round grainsdescribed by granular physics to long soft filaments, the center of textilematerial science. All of these randomly packed systems exhibit forms of selfassembly, evident through their robust packing statistics, and a common,unusual elastoplastic response to oedometric compression. In reviewing packingstatistics, mechanical response characterization and consideration of boundaryeffects, we present a perspective that attempts to establish a link between thebulk and local behaviour of a pile of sand and a wad of cotton, demonstratingthe nest's relationship with each. Finally, potential directions for impactfulapplications are outlined.

Perspective: Mechanics of randomly packed filaments -- the `bird nest' as meta-material