I found this sizing pack at Walgreen's. They have one with their brand, but the Depends comes with two pads. As most of you know, the Depends are OK. I found them to be a little rough on the backside compared to the Walgreen's brand. The S/M fit perfect. Not knowing what to do with the L/XL I checked it's capacity for "large items" It held the load OK, but with pullups, you always need to watch the mess when taking them off. Preaching to the choir, I know. Anyway, I saw CVS has a sizing pack as well. Theirs is $2.99 about the same as Walgreen's. The Depends pack below was a little more, I think $4.99.
I think the perfect use for these sizing packs is the pad inside the S/M with the L/XL over it. Should hold a lot, I think.
Update: I "used" the drip guard last night by itself. It held a before bedtime wetting and the morning flood. I think the Depends drip guards would make and excellent, cheap and locally available booster.