thank you so much everyone for your replies, you all have been so helpful. i feel much more enlightened now. so there are four sizes. i think the standard and large sizes are confusing and bit difficult to tell apart if you don't notice the difference in the lengths. i'm quite petite n don't carry much stuff around normally so i think a standard is large enough for me, or maybe a mini, but i think i would like something i can wear on my shoulder. not sure if the standard will fit either, guess i'll have to go try it out in the shop when the time comes to get one. hehe...