I'm expecting to do some travelling soon - this will involve both backpacking (possibly sleeping on a floor or two, maybe some camping) and air travel.
I'm thinking of bringing a rollmat. It's too big, so I normally let it hang strapped to the bottom of my hiking rucksack. Is this likely to cause any issue as checked in luggage, provided it's tightly strapped? How about extra gear, ie tents and so on?