If you'd like to print your invoices from Trackops and mail them in a windowed envelope, you'll need to use a specific envelope size in order for the mailing address to align properly. See below for the envelope dimensions:
| Size: | 4 1/8 x 9 1/2 |
| Window Size: | 1 1/8 x 4 1/2 |
| Window Position: | 7/8 Left, 1/2 Bottom |
You can order envelopes online that fit these dimensions here:
http://www.envelopes.com/business/window/10-window-envelopes