The ornamental design for a container for high pressure gas, as shown and described.
1. Container for high pressure gas
1.1 : Perspective
1.2 : Front
1.3 : Enlarged view at right end
1.4 : Right
1.5 : Top
The rear view is a mirror image of the front view shown in Fig. 1.2 , and the bottom view is identical to the top view shown in Fig. 1.5 . The broken lines represent portions of the container for high pressure gas which form no part of the claimed design. The dot-dash style broken lines represent the boundary between claimed and unclaimed portions of the design and forms no part of the claim.