Best Fits: 17 - 21" Hardtail mountain bikes and cross bikes * Top Length 19.5", Height 4.5" * Designed to fit a variety of bike frames, these bags can be used for everyday riding, commuting, and adventuring * Adjustable webbing attachments with low profile cam lock buckles for broad array of bike fits * Dimension Polyant Xpac 400 Denier Fabric