this is SUCH a great idea! it is reusing something we all have (t-shirts that aren't being worn), it is frugal (pretty much free) and it provides a an alternative to plastic bags. it even eliminates the need to produce and buy reusable grocery bags! so frugal and so green on so many levels! sigh. if only i had a sewing machine. if you do and you make one of these will you PLEASE email me the pic...i will post it and you will be famous! (ok, maybe not famous, but i will think you are really really cool.)
also-these are much more compact than the bags you can buy for the same purpose so you could actually just roll and put in your purse so that when you shop you would actually have the reusable bag you meant to use and if something leaks...throw it in with your laundry!