Have a strategy about which receipts to keep, which to throw and when.
Groceries: very rarely anything needs to be returned and supermarkets accept a lot without a receipt, because they know nobody keeps them. I leave them in the plastic bag (which I use as bin liner) and if I should really need it – I can go through my stock of empty plastic bags and find it.
Clothes: take it home and stick it on the side of the fridge. In reality, after you have washed a garment, you can’t return it anyway. So once every blue moon, when the fridge gets an outside clean, just toss them all.
Electronic items: file them in a chronological order either in a leaver arch or a box file. You might want to put them together with the instruction booklets – than they are best kept in a magazine holder, because the instructions tend to come in all sorts of sizes. Label the outside of the magazine folder referring to some life changing events, like buying a house or having child number one. You’ll always know that you bought the washing machine before you had your first child. When you need something, just flip through the content of the folder 1998 – 2000 and you’ll be able to find it reasonably quickly.
Make a conscious decision what instructions to keep: “did you ever look at the toaster booklet?” – that’s a sure toss!!!!
Remember: if the chance of ever needing it is very slim, don’t put too much time into filing it!!!