Yogurt pottles, small tin cans, empty spray bottles - they are all fair game. It has taken 2 years to train my wife in the art of asking herself "Can this be used at the shed?" before throwing anything away..
Yes - my wife is on board with that too Any moderately sized cardboard box gets saved for me - just in case. We have even opened preliminary negotiations on the cost of a respray. it pays to plan ahead!
we are also eating a lot more ice cream than we used to as i get through a large number of those plastic tubs with lids......