How can I keep the weld from freezing my character?

When I weld a backpack to my torso it holds my character and the backpack in the position of the backpack. Nothing is anchored and it makes me float and i cant move anything and shift lock doesn't even work. Also please don't tell me to check if its anchored it isn't.

https://gyazo.com/3b5d28ead0e866d807c8c38b2285ad85(visual help)

for a,b in pairs(Player.Character.RockPack:GetChildren()) do
if b.Name == "Base" or b.Name == "Part" then
    weld = Instance.new("ManualWeld")
    weld.Part0 = Player.Character.Torso
    weld.Part1 = b
    weld.C1 = b.CFrame:toObjectSpace(Player.Character.RockPack.Base.CFrame)
    weld.Parent = Player.Character.RockPack.Base
    weld.C0 = CFrame.new(0,-.5,1.1)

b.TopSurface = ("SmoothNoOutlines")
    b.BottomSurface = ("SmoothNoOutlines")
    b.BackSurface = ("SmoothNoOutlines")
    b.FrontSurface = ("SmoothNoOutlines")
    b.RightSurface = ("SmoothNoOutlines")
    b.LeftSurface = ("SmoothNoOutlines")
    b.Material = ("SmoothPlastic")

end
end

It seems based on your picture that the items you are using are anchored in some way. Try unanchoring the parts that you welded, and see if that works. Also, try setting the parts to CanCollide = false

Hope this helps!