[ArrogantBustard]

In the United States, I routinely carry $1, $5, $10, and $20 bills, and find them useful in regular commerce. A small handful of fractional dollar coins (pennies, nickels, dimes, quarters) round things out.

In Canada, the smallest bill is $5 (Canadian); in UK the smallest bill is 5GBP. Even though I try to play the game, over there, and actually use the 1 and 2 (dollar|pound) coins, I always end up with a pocketfull of heavy coins, in order to go about ordinary daily commerce. Theorizing about the glorious wonders of $1 and $2 coins falls apart in the face of actual use.

[Petronski]

I speak with experience as well, and I found the 1€ and 2€ coins to work great with the larger notes. I can't imagine how it would become too heavy, unless you spend the day breaking paper notes and not spending any coins.

According to Google, a two-Pound coin weighs twelve grams. Twelve grams.

At some point, the word "laziness" will become operative here.

[-YYZ-]

The loonie (dollar coin) was OK, but I'd rather still have the $2 bill than the toonie (two dollar coin). I do sometimes find myself with in excess of $10 in $1 and $2 coins in my pocket, and they make a bit of a lump - they're quite large, as you've noticed, and heavyish. Not a big deal, but a minor pain.