my first bag! and a question

[boricuaqueen327]

I received a sewing machine for my last birthday and have been making cage accessories for my rats as well as cloth wipes for dd, doll blankies, etc and today I finally got the nerve up to try making a tote bag to use for class. Here are some pics:
tote bag
Inside

My sister and my mom now want me to amek them each one but i want to use interfacing to make the next bags sturdier. How do I put that into the bag?

[sabrinat]

You can get fusible craftbond or heavy interfacing...the instructions for applying it will be on the packaging.