Quick question: Is Paris carnet a single use only?
 

We just arrived in Paris and I didn't think to ask when I bought them waiting for the Eurostar in London. We are on the 6th floor (no elevator) and are resting from our journey and climb up the stairs!

One ticket is good for one ride on the Metro, including transfers to a different line.

One ticket is good for one ride on a bus, with certain transfer options within a certain amount of time (since you are waiting for a response, I am not looking it up, but it might be 30 minutes) but not on a bus going in the same direction.

Also, one carnet of 10 single tickets can be used by more than one person. In other words, a carnet of 10 tickets do not need to be used by only you.

Thank you!

Carnet simply means booklet. The usual carnet has 10 t+ tickets, each good for a single ride (no matter how long you stay in the métro), or for a single bus ride with a transfer to another bus that is not a bus on the same line going in the opposite direction. You can also buy a carnet of RER tickets if you have a large group, and will get a discount on those tickets, too.

Amy,
Look at http://parisbytrain.com/tag/paris-metro/ for a good explanation of the system, ticketing, and passes. Depending on how long you are going to be in Paris a pass may be a good deal for you.

It's a technical point but a ticket t+ does have a time or duration of use limit of 2 hours when used in the métro/RER or 1+30 when used on a bus.

Another aspect of the ticket t+ sometimes overlooked is that they never expire. If you have any left over from a previous visit to Paris, they are still valid. If dammaged, a ticket t+ will be replaced for free by simply asking at any sales counter (which are becoming more and more difficult to find).

Although carnet does mean book(let), when you buy "un carnet" at a Metro station (and probably the same at a Tabac, etc.), you are given a stack of 10 tickets. The carnet purchase is really just "a reduced per ticket price for buying 10 at the same time."

At the Tabac, the tickets come in a cellophane wrapper.

They are also for specific zones, usually 1-2, covering everywhere within the Peripherique and most places just outside it.

Again just to clarify, the ticket t+ zone 1-2 limit only applies to bus travel. The ticket t+ is valid anywhere on the métro (which can include stations in zone 3) and when traveling on the RER, it is only valid to/from stations within zone 1.