After enough years of looking at bags, the collection that actually gets used narrows to three. There is the everyday bag, which is soft, mid-sized and worn on the shoulder or across the body without thinking. There is the small evening bag, which exists to hold a phone and a card and nothing else. And there is the one worth saving for, which is the structured leather piece bought once and carried for a decade.

Most people own the first and the third and skip the second, then end up carrying a day bag to dinner. Most people also buy the third one too early, before they know what size they actually carry. The order that works is everyday first, evening second, investment last, once you have learned your own habits.

The sections below follow that order. The prices span a wide range on purpose, because the everyday bag should be replaceable and the investment bag should not be.

Grained leather is the practical default. The texture hides scuffing, it resists rain, and it does not show fingerprints, which is why almost every bag that survives daily use is grained rather than smooth. Smooth calf looks better in photographs and marks within a week. Suede is beautiful and should be treated as a dry-weather bag only, because water spotting on suede is effectively permanent. Croc-embossed and woven leathers sit in between: hard-wearing, but they trap dust in the texture.

Structure decides comfort. An unlined or lightly lined soft bag weighs a fraction of a structured one and is far easier to carry for a full day. A structured bag holds its shape on a desk and protects what is inside, at the cost of about a pound of dead weight. Neither is better; they suit different days.

Bags fail in predictable places. Corners go first, then the strap attachment hardware, then the zip pull. Look for reinforced or piped corners, hardware that is screwed rather than glued, and a zip with a metal tape rather than nylon. Handles on a top handle bag should be rolled and stitched, not folded and glued. A lining in cotton twill lasts longer than one in a slippery synthetic, and it does not shred when a pen leaks.

Match the bag to the shape of the day rather than to the outfit. Hands-free and soft for anything involving walking or transport, structured and handheld for anything where you will be seated and want the bag off your clothes, small for evening. If you only get one, take the soft mid-size shoulder bag, because it is the only one of the three that covers most days acceptably.

Do not overfill. A bag stretched past its intended shape never returns, and that single habit ruins more bags than weather does. Stuff a soft bag lightly with tissue when you store it so the sides do not crease, and store it upright and unhung, since hanging a bag by its strap deforms the attachment point over months.

On colour, we would buy the everyday bag in a mid tone that hides wear and the evening bag in whatever you like, because it will barely age. For the investment piece, a mid brown, burgundy or deep green is more useful than black in practice and considerably more useful than cream. Condition leather twice a year with a neutral cream and keep suede away from rain entirely.

The bag we each reach for most is never the most expensive one we own. It is almost always a soft mid-size shoulder bag in grained leather with an adjustable strap, in the two hundred to six hundred range, and it stays in rotation because it is comfortable rather than because it is special.

The evening bag is the one people underrate and the easiest win on this list. It costs less than the others, it barely wears out, and it removes the one situation where an otherwise good outfit gets let down by carrying a work tote to dinner.

If you take one thing away, buy the everyday bag before the investment bag. Carry it for a season, notice what you actually put in it and how you actually wear it, and then spend the money. Almost everyone who does it in that order buys a smaller, softer bag than they would have chosen first.