toilet paper space is easily saved just by not attaching the roll stiffening. obviously you can't hang it then.
johnnie walker originally started making square profile bottles to save space in transport and make them stick firmly to each other so less of them break. some time ago milk (and water) was sold in foil, too bad it all got replaced by plastic crap. I've also read somewhere calculations how much space in transport would be saved if coke bottles were of square profile, but can't find it now.
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toilet paper space is easily saved just by not attaching the roll stiffening. obviously you can't hang it then.
johnnie walker originally started making square profile bottles to save space in transport and make them stick firmly to each other so less of them break. some time ago milk (and water) was sold in foil, too bad it all got replaced by plastic crap. I've also read somewhere calculations how much space in transport would be saved if coke bottles were of square profile, but can't find it now.
The square Coke bottle concept was designed by Andrew Kim: http://www.minimallyminimal.com/2010/3/15/ecocoke.html It allows for 1-2 additional bottles in the space it takes to transport 4 round bottles.