Small 20L is 40x25x20cm with a weight of just 0.5kg Medium 28L is 45x36x20cm with a weight of just 0.74kg Large 44L is 55x40x20cm with a weight of just 0.8kg Practical, multi-purpose backpack made of durable high density fabric - sized to double up as a convenient underseat cabin bag. Designed to comply with most carry-on policies whilst the dimensions give maximum packing capacity within the allowed carry-on restrictions. Made from a durable, high density fabric yet still lightweight with padded shoulder straps, top and side carry handles to keep you comfortable on your journey. Keep your belongings organised with a large front pocket, additional zipped pockets inside and compression straps to keep everything tightly packed. Keep your valuables safe with chunky, lockable zips (padlock not included). Comes with a 1 Year Warranty.