First, resources are not scavenged items. They are things like granite and scrap metal that are found on different terrain types and are free for the taking. Presumably these are the building materials.
At present you can load up to 4 resources of the same type on your back but with a penalty of slower movement. I was able to load 3 resources with no slow down however. Below is a picture of my character with 4 scrap metal resources on his back.
Yes, he has a dagger in his hand as that is the noob armed weapon for the blades specialty. Others are clubs and axes.