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The Zomake packable backpack is the spare bag you keep folded in a suitcase until you need one. It opens to 30 litres and weighs 0.74 pounds. Folded, it is about the size of a sandwich and disappears into a corner of your checked bag.

Thirty litres open, sandwich-sized folded

Open, the pack measures 19 by 13 by 7 inches. Folded into its own pocket it is 10 by 8 by 3 inches. The whole thing weighs 0.74 pounds. The fabric is water-resistant nylon. Inside there is a main compartment with a divider. Outside there are two front pockets, two side pockets and a privacy pocket. The side pockets have retention straps for a bottle or an umbrella. A chest buckle holds it steady and has a whistle built in. There are reflectors on both sides of the front. Zomake offers it in sixteen colours and patterns.

The bag you did not pack, until you need one

You get to the hotel and someone suggests a hike, or a market, or a beach afternoon. Your main bag is a suitcase and your daypack is at home. This is the answer to that. It costs almost nothing to bring on the off chance. One owner uses it as a personal item on flights and says it takes a real load.

What keeps coming up

Light is the word that repeats. Owners talk about it folding into a suitcase and being forgotten until they want it. Then it holds far more than they expected. The pockets get named often, and several people have bought a second one in another colour. A few keep one for the gym and one for the kids.

The trade is the fabric, and it is worth being straight about. Thin nylon is what lets a 30-litre bag fold to sandwich size and weigh under a pound. It also means this is a second bag rather than a pack you load heavily every day. Owners who use it hard do report seams and straps giving out after some months. Keep the loads light and it will keep folding away for years.