will the backpack except the height of the double battery connected

Yes, it holds my Inogen one G4 with the double battery attached, with ample room.

Is it possible to charge it by putting the power cord from the top of the bag down to the port?

I suppose you can but the one I bought had an opening at the bottom of the bag adjacent to the charging port that works for me

work at high altitude?

My husband always took it with him on an airplane and it did well. Also when we were in Flagstaff AZ. It did well, but we didn't stay there long. It was too much for my husband. His oxygen level was not good there. Phoenix and Sedona was better.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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CURMIO Portable Oxygen Concentrators Backpack, Universal POC Travel Carrying Bag with Mesh Panels for Breathability, Compatible for Inogen, Oxygo, Caire Units, Perfect for on-The-go,Gray-Bag ONLY

Product ID: 294294943

🎒Fits multiple POC models (9.5x3.7x9.6 in)

🔒Anti-theft zipper pocket for valuables

🌬️Mesh panels for breathability & heat dissipation

Description

🎒 Carry your breath of fresh air in style and confidence!

ERGONOMIC COMFORT - Adjustable padded straps and top hook for effortless carrying and quick hanging anywhere.
SECURE CONVENIENT - Anti-theft zipper pocket plus transparent display flap for easy monitoring on the go.
BREATHABLE MESH DESIGN - Keeps your oxygen concentrator cool and extends device life with smart ventilation.
UNIVERSAL COMPATIBILITY - Seamlessly fits Inogen, OxyGo, Caire & Philips units for worry-free travel.
DUAL COMPARTMENT STORAGE - Separate your POC and essentials like batteries or meds with spacious, organized pockets.

The CURMIO Portable Oxygen Concentrators Backpack is a lightweight, water-resistant carrying solution designed to fit popular POC models like Inogen One and Philips Respironics. Featuring breathable mesh panels for heat dissipation, dual compartments for organized storage, and anti-theft pockets, it ensures secure, comfortable, and convenient transport of your oxygen therapy device and essentials during travel or daily use.

Specifications

ASIN	B08FHZCB7J
Best Sellers Rank	#231,624 in Health ( See Top 100 in Health ) #346 in Oxygen Therapy Products
Brand Name	CURMIO
Capacity	1 liters
Closure Type	Flap, Zipper
Color	Gray
Customer Reviews	4.0 4.0 out of 5 stars (269)
Handle Type	Web Handle
Item Dimensions L x W x H	38.9L x 9.4W x 24.1H centimeters
Item Weight	0.19 Kilograms
Manufacturer	CURMIO
Manufacturer Part Number	CACR02302(New)
Material Type	Nylon
Model Number	CACR02302(New)
Number of Compartments	2
Number of Items	1
Number of Packs	1
Recommended Uses For Product	Medical Transportation, Oxygen Therapy
Size	1 Count (Pack of 1)
Strap Type	Adjustable
Style Name	Practical
Unit Count	1 Count
Water Resistance Level	Water Resistant

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