How much does the backpack weigh?

Very light. I'm not sure the exact weight, but I'd guess a half pound to a pound. Somewhere in there.

How can I get the blue backpack as a 3 in 1? Only the black and grey are listed

Hi Thank you for asking. Unfortunately, the blue backpack set 3in1 is out of stock and will be available as soon as new shipping arrives at Amazon's warehouse. But, you can create your own set 3in1 by buying: - blue single backpack and - 2L Liter Hydration Bladder & Cooler Bag Here's the direct link: https://www.amazon.com/dp/B01LNQM494 You can use the 15% off coupon code BIGFMOFF at checkout. I hope you will utilize the code but if there is anything else that I can be of assistance with, please feel free to let me know! Thank you. David FREEMOVE Customer Service

Como se llevan los bastones en la mochila?

Hi. Unfortunately, nobody from our side speaks or understand Spanish. But from the google translator, we learn that you asked about "How the canes are carried in the backpack". If you have collapsible trekking poles, then you just collapse them to the minimal length and then put one stick on the left and the other to the right side on the backpack's trekking pole fixing system. This is nicely shown on the product page in the 5th image on the left side images menu. Click on the image and then hower with the mouse on it to enlarge the view. I hope I managed to answer your question but, If there is anything else that I can be of assistance with, please feel free to let me know. Thank you. Kind regards, David FREEMOVE Customer Service