Given a travel related situation, and given a specific question about the situation, summarize the question into a title
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Question: I'd like to see the Catacombs of Paris in September 2017. It appears that tickets can be purchased in advance from http://b12-gat.apps.paris.fr/accueil.aspx ...  is the demand such that purchasing tickets in advance is necessary if you want to see it?


Answer: catacombs of paris: should tickets be purchased in advance?


Question: (I think) my question is simple. I'm appealing to the experience of others to ask


  Would you recommend carrying a sleeping bag while hostelling around Europe in summer?



Answer: Sleeping bag while hostelling around Europe in summer?


Question: The dimensions permitted for Ryanair's small hand luggage are 35x20x20. An Eastpak backpack is about 45x38x11. Will it be allowed on board?
Please refer your personal experiences on this subject.

EDIT: What if I carry it nearly empty and folded into 2 parts, so that it'll fit? (I really need to take a backpack with me, but there's no room in my other luggage, that's why I'm asking these questions)


Answer:
Eastpak backpack as small luggage with Ryanair?