My training regimen has been severely disrupted these past two weeks with business trips out of town and with helping my sister move out of an apartment she's been in for 20 years. I'm going to walk 2-3 miles with the loaded pack on my back the next couple of early mornings.
It's always that way, life gets in the way of training. Just take those last walks (maybe with 10 extra pounds in the pack) to get the feet used to the boots and the shoulders and hips used to the pack. Take the day off before you leave to let all the muscles recover so you have fresh legs and you will be fine. Can't wait to hear how it all goes.