巴西采购需求：背包、腰包、袜子、运动服饰、登山杖、运动器材

I'm interested in purchasing a specific hydration vest backpack, ideally in medium size. Could you provide me with details on your availability for this item? I'm also keen to know more about the features and benefits this vest offers, as well as any options for customization. Additionally, could you inform me about the purchasing process, including payment options, shipping costs, and estimated delivery times to Brazil? If there are any promotions or bulk order discounts available, I'd love to hear about those too. Looking forward to your prompt response so I can finalize my order!