Is it okay to hibernate a netbook and put it in a bag?

I have this Acer Aspire One netbook, and I used to set it in hibernate state and put it in my bag.

I do this so I can have a quick start-up (I used every free moments to continue my work so it's pretty unpredictable and I want my netbook to be ready for it).

Is it okay for the battery or it will shorten the lifespan?

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