I used it for about 3 days. It hasn't lost its shape, and it's in almost new condition. ⚠️ As noted in the fourth image, there are some whitish areas. Please purchase only if you understand that this item has been stored by a private individual. Instant purchase is OK. Material: Vinylon Capacity: 16L Weight: Approximately 300g Size: Height: Approximately 38cm x Width: Approximately 27cm x Depth: Approximately 13cm (A4 size compatible) There may be slight variations.