Bag Materials 101: Nylon, Polyester, PU and Vegan Leather

Short answer: Nylon is the toughest and lightest of the synthetics; polyester is cheaper, colour-fast and slightly less abrasion-resistant; PU is a coated synthetic that mimics leather but has a finite lifespan; "vegan leather" is an umbrella term that can mean PU, plant-based materials or coated fabric. For padded everyday bags, synthetics usually win on weight and weather resistance.

Material labels are marketing as much as information, so it helps to know what sits underneath them. Always check the individual product page for exact composition.

Nylon

A synthetic polymer used widely in bags and outerwear. It is the benchmark for everyday durability.

• Strengths: high abrasion resistance, light, flexible, takes dye well
• Weaknesses: can fade with long sun exposure; lower deniers scuff
• Feels like: smooth, slightly crisp, light in the hand
• Good for: daily bags, travel, anything that takes abuse

Polyester

The other workhorse synthetic, common in linings and padded shells.

• Strengths: holds colour well, resists stretching, dries fast, affordable
• Weaknesses: slightly less abrasion-resistant than nylon at equal weight
• Feels like: soft, a little less crisp than nylon
• Good for: linings, padded exteriors, printed finishes

PU (polyurethane)

A coating applied to a fabric base to imitate leather. It is what most "vegan leather" actually is.

• Strengths: looks like leather, wipes clean, consistent surface, animal-free
• Weaknesses: finite lifespan — it can crack or peel after a few years; less breathable
• Feels like: smooth and slightly plasticky
• Good for: structured shapes and leather looks without leather

"Vegan leather" — read the label

This is a category, not a material. It can mean PU, PVC, coated canvas, or newer plant-based options (pineapple leaf, cactus, apple waste, mycelium). They differ significantly in durability and price, so look for the specific material named on the product page.

Comparison at a glance

Material	Weight	Durability	Water	Lifespan
Nylon	Very light	High	Resistant	Long
Polyester	Light	Medium-high	Resistant	Long
PU / vegan leather	Medium	Medium	Wipeable	Finite (can peel)
Full-grain leather	Heavier	Very high	Needs care	Very long

What this means for a padded bag

Padded construction works best with light synthetic shells. Padding adds volume, so the outer material needs to be light — otherwise the bag stops being comfortable. That is why most cloud and puffer bags use synthetic exteriors rather than heavy leather.

How to check before you buy

1. Read the composition on the product page, not just the marketing name
2. Press the surface — quality synthetics spring back
3. Check the lining — it is where cheap materials fail first
4. Look at the stitching density at stress points
5. Ask what the care instructions are; vague care usually means spot-clean only

Frequently asked questions

Is vegan leather durable?

Reasonably, but PU-based versions have a finite life and may crack or peel after some years. Plant-based options vary widely.

Which bag material is lightest?

Nylon, followed closely by polyester — both far lighter than leather at the same size.

Does nylon hold up in rain?

Yes, it is naturally water-resistant and dries quickly, though seams are not sealed unless stated.

How do I clean synthetic bag materials?

Usually a soft damp cloth with a drop of mild soap. Avoid solvents and machine washing.

Is leather always better quality?

Not necessarily — it lasts long, but it is heavier, needs care, and is not always the right choice for a light everyday bag.

See the full Cloud 25 collection for material and care details on each product page.

Related reading

• JW PEI Alternatives: Vegan Leather or Padded Nylon?