I make and use these all the time and for them it could be something they could make as gifts. I gave them each some canvas - which was lined curtain fabric. Lined curtain fabric is great for these bags as it is sturdy but also waterproof - so great for the beach etc. In the class they made the plain bag and decorated it using fabric sharpies. They looked great and were useful!
I also took the opportunity to whip one up. I had this drill from Spotlight that I love. I would love to have a skirt out of it - but even for me it is too much so a bag it was. The handles are from the canvas of the girls bags and the straps are folded in half for a feature but it actually makes it much easier to use!