We have used the blue Ikea bags for the last 2 years which are 20p each I think or at least were when we bought them, and which hold a weeks veg, and have generally had them returned as we have the same customers each time. We are not selling very many 'boxes' however maybe 10-12/week
For ease of deliveries it is best to have clusters of people (though obviously better if folk can collect)
Generally speaking people have simple tastes and want the basic veg, though will tolerate some of the more unusual ones as extras - Cheryl puts in a recipe sheet for anything a bit unusual. 2 years ago we had a glut of chard - a great veg I think - it grew so well and kept on producing, but people seemed a bit scared and confused by it. Cheryl did feed-back forms and people said they got too much chard.
We have been in contact with a local charity who supply schools and hospitals and this year may try to supply them as this will save a lot of time with deliveries etc. Again they just are looking for the basic veg, and apparently only want 'good quality' products so this may rule out some of our slug-nibbled or infested veg - though we are not organic we do not use insecticides etc.
We have done bags of washed salad - using IKEA sealable bags; these go down well but is of course time consuming to prepare
A mixed bunch of herbs tied with string goes down well