How to build a nest in the days of men

Lol title?

My guinea pig Jenny decided to build herself a nest in a very newly bought bag of hay. I wouldn't so much mind - if she wouldn't always eat the bag's plastic! O.o Luckily, in all those years, they never showed any symptoms of effection from eating that stuff O.o They...yes...

This photo is related to this breakout: [link]