Are these good for 10x13 poly bags?

The OL395WX features a permanent adhesive that is designed to work on a variety of surfaces. If you would like some sample labels to test in your application, please feel free to complete our sample request form using the link below: https://www.onlinelabels.com/samples

How do I set up my printer to print USPS shipping labels from my WooCommerce website? Do I need to use a program to import the shipping label into?

These labels are primarily designed to use with USPS. Generally, each shipping platform has their own template for printing shipping labels. The placement of the labels can vary between WooCommerce, PirateShip, etc., so I recommend printing the PDF template of these labels (linked below) on a sheet of plain copy paper at actual size, then print your shipping labels on that sheet of paper to see if they line up properly. You normally don't need to adjust any settings on your printer to print shipping labels, if it's the correct template. https://www.onlinelabels.com/templates/blank/ol395?type=pdf If you have any questions or need additional information, please reach out to us at the link below. https://secure.onlinelabels.com/Support/SupportRequest.aspx

Are these shipping labels compatible with PirateShip?

Below is a link to shipping labels that are compatible with PirateShip, which includes the OL395. https://www.onlinelabels.com/uses/shipping-labels#gPirateShipShippingLabels

I only have an inkjet printer. Do your customers who use inkjet ever have issues when using these labels to mail via USPS. I'm concerned about them getting ruined by moisture.

The 100% Recycled White (RX) is an uncoated paper-based material and would not be recommended for use in wet applications. However, it can be used with both inkjet and laser printers. Most shipping and mailing labels are not weatherproof and can be used with either inkjet or laser. You're welcome to try a few sheets at no cost by visiting the link below. https://www.onlinelabels.com/samples

Is there a standard Word label format for these labels? OL395 is not listed on Office 365?

We do offer a variety of templates, including Microsoft Word, on the product page as well as at the link below. https://www.onlinelabels.com/templates/blank/ol395