With the sleepsack zipped fully, El can't help but want to fit her free arm into the other inner sleeve... With just the right angle, she can stretch the sleepsack and push outwards, pushing her arm into the sleeve.
... getting her arms out will be another matter though...
One of El's more unwise impulse purchases hit her front door, and she can't help but try it on herself...!
There is no way this ends badly for her :)