Steampunk and Fantasy. Scouts use ancient backpacks to fly to different places. There is some sword fighting involved.

[Bryce]

I read this book somewhere between 2010 and 2014, it was newer at the time with a sequel coming out that was going to preorder but forgot. The machines were like jetpacks, but called something else. I can't for the life of me remember the book. I believe it was young adult.

[Capn]

I don't suppose it sounds entirely similar to Parker's thread, but I'll mention in case a book guessed in it is yours:
https://www.goodreads.com/topic/show/...

There's an absolutely gargantuan Steampunk list, if you feel like straining your eyes:
https://www.goodreads.com/list/show/6...