I didn't keep all my coins in the coin pouch at once. Instead, if I'm going out for just one shopping trip, I'd bring only the minimum number of small coins to make approximately any amount (eg, 1x1¢, 2x2¢, 1x5¢, 4x20¢). As long as you get the last digit right, it doesn't matter if you're some multiple of 10¢ over, and it's easier to get the last digit right when you have fewer coins to sort through to find the one you need.