I want to order as much as can fit in one container.
I want to order 1 container's amount.
ご質問ありがとうございます。
「詰め込める」はpackとput inと言えますので、as much as can be packed inに訳せますが、as much as can fit inがより簡単に言えると思って、提案しています。
回答の英文に商品を入れることができます。
例：I want to order as much wine as can fit in one container. （数えられるものなら、as much asじゃなくてas many asになります。例：I want to order as many T-shirts as can fit...).
例：I want to order 1 container's amount of baseballs.
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