Stockpiling tips

Although I'm finding success in using coupons to drastically reduce some of the items we love and use, I'm having a hard time building our stockpile.  We still live week to week off our groceries so our stockpile is small.  I ran across this site here tonight and found it extremely helpful. Also, excited about attending my friend's Money Wise class this coming Wednesday night.

Do you have any helpful stockpiling tips to share?