100/90 vs 110/90 tube size

So I go buy a new tube today to go with my new 110/90-19 rear tire. When I get home I notice that the box is marked 100/90-19. So I called the shop back and they said don't worry about it and that the 100/90 tube would be just fine in a 110/90 tire.

What say ye of TT? Should I go ahead and use it, or should I go back (on Monday) and exchange it?

You will be fine. They expand so much anyway that it will fill up the tire.

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