Reusable Produce Bags, Multi-Pack

Link to buy in USA: plastic mesh 15 pack (amazon.com) , nylon chico bags (amazon)
Link to buy in Canada: cotton mesh bags , Amazon.ca 9 piece plastic mesh bundle 
 
Small packages of reusable produce bags should be available in the produce section of your local grocery store for only a few dollars. Generally there are mesh (either pastic or cotton/ natural fiber), canvas (no holes, ideal for seeds, bulk powders, flour etc.) and nylon (no holes, made to keep greens fresh, or for fine foods and powders... Chico is a great brand available in US or CAN). 
 
You do not need a ton of bags! I have a 15 pack linked that I was gifted, and I gave many of those away to friends and family. Extras are handy so you can throw the bags in the laundry though. 
 
Brand isn't too important, if buying online check reviews, but if buying at your local store, you are probably okay!