We have 2 of the 13 qt coolers. One for me up front and one for my wife in the rear. We have fished the hottest parts of summer in southern Illinois and rarely lose more than a few Minnows each per trip. I know we have loaded each of them with as many as 100 Minnows without having issue. We quickly learned that we didn't need that many on the boat and usually take around 50-60 each. I replaced the garbage pump that comes with the units promptly with frabil units which are much much quieter and put out a lot more air. The batteries seem to last forever in them too. I'm not sure of the model of pump, but we purchased them at Walmart. The engel pumps we received get hot and zap the batteries quickly. The frabil pumps are near silent and I often check to make sure they are still running because I can't hear them.

I I thought long and hard about getting two of the medium size, but for our purpose these are plenty big. They are quite heavy when full even for their small size.

We we we're introduced to these coolers when we went on a guided trip with Kyle Schoenherr. He had a 30 qt and I recall it was literally packed with Minnows. If I were to guess there were at least a full pound of fatheads in his. He may have had oxygen going to them because the line came from his boat, but it may have just been an onboard pump. Either way there was a serious amount of minnows in his cooler.