These are two of our most popular tanks. BOTH hold 660 straws.The XC 20 holds for 20 weeks, the SC 11/7 for 7 weeks. The 11/7 is the baby version of the XC 20 with the same capacity, yet half the weight when full. A perfect "grab and go" storage tank which is great for use at expos, jackpot shows or just as a carry tank when you AI. Check them out and compare