Here are the packs I made 2 years ago (oh how time flew so fast?) - sandwich and snack packs.
I used cotton as the outside fabric and ripstop nylon for lining. It has no other fasteners, just french seams and flap over - So simple yet effective.
I just throw them in the dishwasher when it needs a wash, inside out.
I will do a tutorial on this when I get a chance, so bear with me or send me many comments to make me feel guilty and do it asap! :D
Cheers till later.