Backpacking and Hiking after Breast Augmentation

I am an avid hiker and backpacker. I typically carry around 40-50 pounds in my backpack for 10-13 miles per day over a period of 5-10 days. My backpack has a sternum strap, and I want to make sure that this will not adversely affect my implants (assuming I wait at least six weeks after surgery to go on an excursion). The implants are both 350cc silicone, placed under the muscle. Thank you!