I love Invisibobbles because they really grip my hair and don’t pull when you take them out. I have never tried this myself, but I have heard that when they stretch from use, you can apply heat (hair-drier or pop them in hot water) and they go back to their original size.
I usually stock up when they are on sale. I am not fussy so I graph whatever colour is cheapest. Yesterday I found dark brown ones and multicoloured ones on sale at Sephora. I got one pack of each. It was only this morning when I could not stop smelling chocolate that I realised the brown ones were chocolate-scented. The multi-coloured ones are supposed to smell like doughnuts it seems, but I think they smell more like bubble gum.