Credit: trans-matters (tumblr)
• Does it hurt to take a deep breath? Yes? Then it's too tight.
• Do you feel dizzy? Yes? Then it's too tight.
• Do you have bruising and is it sensitive to the touch? Yes? Then it's too tight.
• Do you have pain for several hours or days after binding? Yes? Then it's too tight.
Please do not continue to use a tight binder! It will do nothing but damage. Get a new one of your size (or even slightly bigger) in which you feel comfortable and healthy. Not only will this save you from physical issues but also mental stress!

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Binding: Maxwell's Guide
Non-FictionA Guide to Binding complied by Maxwell Xander (None of the images belong to me; credit to owners)