Without the rucksack it would have been a couple more trips. Use the rucksack and two shopping bags. I think I would fall over my feet if I had one on the front as well. 
I was stashing in a hidey hole when children came home an hour earlier than expected the rest will have to wait until tomorrow when they go out again. I will work on the after bedtime hidey holes, after they have gone to bed.
Hidey holes are not very organised. I am trying to put a mixture of produce in each one to make meals. I did not have time to write a list of the latest place but a significant amount had been stashed including fruit juice, soya milk, chopped tomatoes, peas, sweetcorn, olives, chickpeas, mandarins, tomato soup, mushroom soup pineapples, raisins, sultanas, oats apricots, yet to add rice, pasta, various dried beans, tinned beans, water, dried milk and tuna.
I am trying to do weekly shop type shops now, just bigger, to not draw attention to the stashing. It was a bit obvious in one supermarket though as it was nearly all tins with one lonely broccoli and a pack of frozen veg.