Help my suitcase won't close!

I;ve been packing and packing and giving away and giving away. All that and my suitcase will not close. So back to the drawing board. More downsizing. It is just a process of elimination. Two piles, what I think I need and what I need. What I will wear and what I think I will wear; what will I actually wear. I have my favorites and the suitcase closes now. Wait though, that contains winter cloths. It is still hot in Arizona 2 days ago it was 108 degrees there. I still have to make room for my summer clothes too. I still have to find room for my hiking (mountain climbing) boots. More downsizing; continuing the process.