☆ Double Main Compartments + Multi-Functional Pocket Structure Featuring two main pockets, two certificate pockets, two pen pockets, a separate PC compartment, and a wet/dry separation pocket, among others. Neatly organize your belongings for 5-7 day business trips or travel, and instantly access the items you need. ☆ One-Touch Expansion Function for Flexible Use Instantly switch from daily mode 30L (ideal for commuting) to expansion mode 45L (equivalent to a 20-inch suitcase), accommodating large-capacity needs for travel and business trips. The 10cm expansion saves you the trouble of carrying a suitcase. ☆ High-Density Waterproof Splash-Proof & Abrasion-Resistant Material for Peace of Mind Made with water-repellent and abrasion-resistant material, simply wipe away water droplets to keep it clean even on rainy days, and it's easy to wash. Tested for scratch resistance, protecting the bag from minor impacts during travel or commuting. ☆ 3-Way Design + Detailed Features for Enhanced Comfort Use as a backpack, shoulder bag, or two types of hand-carry styles, changing the style to suit your outing. The honeycomb breathable shoulder straps and cushioned hand-carry belt reduce the burden on your shoulders and hands even when carried for extended periods. Immediate purchase welcome! 30L → 45L after expansion, Black See other products here: #Ottotto'sShop