Thank you for viewing! This is a cooler pack backpack that you can use to prevent heatstroke in the coming season♪ The inside is made of aluminum material ^_^ You can spend comfortably when playing in the park, taking a walk, or riding a car or bicycle ╰(*´︶`*)╯♡ Also, you can go out with cold food such as jelly together with the ice pack, and your children will be happy ╰(*´︶`*)╯ As well as a backpack, you can also use it as a shoulder bag or handbag by changing the way you attach the shoulder straps♪ Made of rubber, it can be used from 0 to around 3 years old♪ (Individual differences apply) Size: Approximately 13cm x 16cm Shoulder strap length: Approximately 26cm (Rubber length: Approximately 25cm) When fully extended: Approximately 46cm You can add a chest belt to prevent shoulder slippage for an additional 200 yen (*´꒳`*) ⚠︎OK to wash with water (gentle wash), but do not use a dryer. ※The pattern placement may differ from the actual product. Please understand. ※Because it is handmade by an amateur, I try to make it carefully, but please understand that there may be imperfections in the sewing, such as distortion, misalignment, and double stitching. ※If you are in a hurry, I will try to accommodate you as much as possible, so please comment (o^^o) ※I'm sorry, but we cannot offer discounts or combined discounts, so please understand m(_ _)m