If that stuff bulks up the cargo pockets you may have to rethink the load plan for a longer walk.

I hike in BDU pants and am reluctant to put much more than a wallet or a bandana into the cargo pockets because of chafing.
But I'm hiking 10 or so miles and a little chafing adds up.

I once picked up about 150 empty .40S&W cases someone had left at a shooting spot and put them in my cargo pockets. Was real glad that I didn't have to go more than a mile or so back to where I could empty them into the jeep.