I will usually sling the rifle and hold the shotgun, I have a sling on both. I run my head through the sling and let the rifle ride diagonally across my back. I don't carry enough stuff to need a pack but that'd be handy for sure, My usual list is;
Seat, calls around neck, decoy, electric caller "foxpro wildfire
", couple extra rounds for both guns, gloves, mask, scent killer, shooting sticks. Most of the stuff I'm wearing so it's really not all that much to carry, I drop my decoy and caller into my seat car it with one hand and the shotgun in the other. Once you get the technique it's not bad at all.