Actually I returned them and exchanged for #9 3 7/8 x 8 7/8. It was difficult to fit one piece of standard paper into envelope and the flap would not fold over it. It would be impossible to put 2 sheets in.
These were the only size in stock and they’re too small to fill with standard 8.5x11 folded billing sheets. We returned them and had to buy on line. Would be better if they stocked both sizes.
I run a pool service business and these envelopes are perfect for my monthly billing - one small lick and these envelopes seal easily and securely - a bit expensive this time - usually able to find a better deal at Staples but this is a trustworthy product.