You buy a packet of chips, and munch on a few. Then, you accept that your next round is not going to be as crispy. There's always the chance that the chips might get soggy. Last week, we applauded American author-chef Padma Lakshmi's video on Twitter. It demonstrated a cool hack of folding a bag of chips to ensure it was vacuum-tight without having to clip it.

It got us thinking: in times of shortage of supplies, where rationing is critical, how can we improve the shelf life of food? We spoke to experts who have got you covered.