I've got a three day walk planned in the Thames hills with my young boys the week after easter and need a tramping pack with some volume to help carry some of their kit too. 

We haven't done any tramps like this before so I'm loathe to pay full price for a pack that only gets used once or twice. 

I'll be looking for a Large or Medium Large size. It will need a rain cover and ideally is relatively modern for ergonomics. 

The brand doesn't matter too much but my budget can flex to accommodate something if it's special. 

Looking to spend around $150. 

If anyone has something gathering dust I can pickup then please PM with some details/pics.