Airtight waterproof hearing aid dryer (or, really, for any other small items)

Step 10 Trim and square up

Now you'll trim the edges of your fabric so that the bias tape will fit perfectly. To do this, first place the bias tape lengthwise down the right edge of your piece. Keep the tape folded. The open edge of the tape should butt up exactly to the edge of the baggie that's inside the pouch (just feel for the baggie's edge with your fingers, and the tape should line up perfectly). Trim the pouch fabric right along the folded edge of your bias tape. (Make sure you don't accidentally cut the fold of the bias tape, as that would wreck the tape!)

Now trim the opposite side of your pouch, and the bottom edge, in the exact same fashion, being sure to butt the tape against the edge of the baggie inside, and being careful not to cut the fold of the bias tape.