Hello, Whats a nice medium size backpack for around $50? I want one that can hold my survival gear, some food, first aid, ammo. For 1 or 2 days of hunting.

I am not sure I understand your question? Will you be using this backpack on over night hunting trips?
Do you hunt out of a base camp that can access with your truck that you return to every night?

If you are looking for a backpack for holding 1 to 2-days camping gear and you are packing your camp on your back, you should look at the Badlands-2200 series pack.

for cheap, good backpacks look at Camelbak on ebay